Tuning SU Carburetors

5/10/2018 Tuning SU Carburetors

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TUNING

~NCWDIING fULL NIE8DLIE CIHlARlS


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CONTENTS

SECTION 1A four-point guide to getting the best performanceand economy from your S.U.(s). Page 6

SECTION 2Servicing. dismantling and reassembly. Page 12

SECTION 3Tuning twin carburetters. Page 24

APPENDIX 1Carburetter specifications Page 31

APPENDIX 2Needle charts Page 38

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SPEEDPORTMOTOBOOKST H I P E R f O R M A N C E P A P I R B A C K S

INTRODUCTION TO TUNINGMartyn WatkinsThe first in a series of tuningcompanions designed to give thenovice a complete guide to allaspects of the tuning and modifi-cation of the production car, Thisbook covers the theory of how acar works and the methods bywhich it can be made to workmore efficiently,

37~p 0/6)

TUNING COMPANION VOl. 2.ENGINES ANDTRANSMISSIONSMartyn WatkinsFollowing on from the prslirnin-aries of 'Introduction to Tuning'this second book explains thetuning possibilities for cylinderheads, valves, camshafts, car-buretters, cranks and transmis-sions. 50p (10/-4

Tuning Companion Vol. 3-Suspension and brakes byMartyn WatkinsThis book is the third and finalvolume in the series of TuningCompanions by MartynWatkins. It enlarges on thedetails given in volume 1 andcovers suspension and itsmodifications, wheels andtyres, brakes, bodyworkmodification instruments andlights. 50p (10/--J


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S.U. CARBURETTORS

90p 070p '1SOp1 '60090p CSOp CISOp Ii60p t~90p [1SOP I-SOp LJ1'SOC

40p r:l~70p U40p r:90p :'_J60p '-'70p - _,.._)37Y..p~SOp [jSOp []gOP C40p CBOp c : : ;gOP G

The Speed Sport Motobooks series is designed to present the perform-ance and motor sport enthusiast with inexpensive guides to theirparticular enthusiasm. The books are constantly re-edited to keep upwith modern trends and innovations, and are written by accreditedexperts backed by the editorial team from the monthly magazineCars and Car Conversions. The list is always growing and some of themore popular titles are listed here. Should you require an up to date list,please send a stamped addressed envelope to us at the address below.MARQUE TUNING GUIDESTUNING A MINI by Clive TrickeyMORE MINI TUNING by Clive TrickeyTUNING STANDARD-TRIUMPHS up to 1300 c.c.TUNING STANDARD TRIUMPHS over 1300ccTUNING VOLKSWAGENS by Peter NoadTUNING ESCORTS AND CAPRIS by David VizardTUNING BMC SPORTS CARS by Mike GartonTUNING ANGLIAS & CORTINASTUNI"IG TWIN CAM FORDSTUNING IMPS by Willy GriffithsTUNING VIVAsl by Blydenstein and CoburnTUNING VB ENGINES by David VizardCARBURETTER MAINTENANCE AND TUNINGWEBER CARBURETTORS by John Passim.STROMBERG CARBURETTERSSPORT HANDBOOKSHOW TO START RALLYING by R. Hudson-EvansHOW TO START MOTOR RACING by Wally HallHOW TO START AUTOCROSS AND RALLYCROSSAUTOMOBILE ENGINEERINGINTRODUCTION TO TUNINGENGINES & TRANSMISSIONSSUSPENSION & BRAKESAUTO ELECTRICS by David WestgateMODIFYING PRODUCTION CYLINDER HEADSRACING ENGINE PREPARATION by Clive TrickeyCAR CUSTOMISING by Paul CockburnThese and other advertised Speedsport Motobooks should be obtain-able from all good booksellers. If you have any difficulty please tickthe appropriate box and send your remittance for the purchase priceplus 7 Y..por postage and packing direct to us.

SPEEDSPORT MOTOBOOKSACORN HOUSE, VICTORIA ROAD, ACTON LONDON W3.. .


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FIRST IMPRESSION APRIL 1968SECOND IMPRESSION JULY 1970

ACKNOWLEDGEMENT

We should like to acknowledge the invaluable assistance given by the S.U. Carburetter Companyin letti ng us reproduce so much of their literature. In particular we thank them for the informationon their carburener specificarions and needles - which will be of so much help to readers ofthis book.We hope that this book will serve as a trusty guide to millions of motorists running cars withS.U. carburetters

IMPORTANTThe tuning procedure described in this publication doesnot apply to vehicles sold in the U.S.A. after October,1968, and which are made to satisfy the U.S.A. statutoryregulations regarding exhaust emission. These carburettersmust not be dismantled or the settings altered withoutreference to the relevant rnanufact ur qr s ' servicinginstructions.

Printed and Published bySPEED AND SPORTS PUBLICATIONS LTD

Acorn House, Victoria Road, Acton, London W.3.

Copyright 1968 by Speed and Sports Publications ltd. All rights reserved

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SECTION ISINCE so many people have been

writing in asking what needles,and jets to use in such and suchcar or induction set-up, and inview of the fact that it is impossiblein most cases to give a clear cutanswer we have attempted to ex-plain just how one can obtain thecorrect answers.First let us consider why it isusually impossible to give a clear-cut answer to reader's carburationproblems. As explained in therecent Mini Tuning series andbook, even small variations inengine specification can radicallyalter the carburation requirementsof an engine. These variations canbe as obscure as small differencesin port or chamber shape, or asobvious as the fitting of largervalves and different manifolds andcamshafts. Thus it is quite pos-sible that two identical motorswith outwardly similar conver-sions, and identical written speci-fications, can in fact have quitedifferent carburation require-ments. To complicate matters evenfurther there is still the humanfactor of the fuel-consumption-to-performance-ratio preference ofthe individual. Tuning an S.U. Car-buretter installation to match anengine specification is, a matter ofselecting the following items;-

i Size and number of carbu-retter(s) to be used.

ii Strength of piston springfitted above the carbu retterpiston.

iii Entry of air into carburetter.i.e;- The fitting of an air cleanersystem or the selection of a sizeand type of ram pipe, or the deci-sion to use open-intakes.

iv Profile of jet needle.Size of jet and range of jet needlesis governed by the size of car-buretter.To be certain of obtaining thecorrect solutions to the abovepoints, the engine has to be moun-ted on a test bed and a series ofset procedures carried out.However, it is possible to arriveat a carburation setting which isreasonably close to the optimumby careful road testing and apply-ing a given sequence to the opera-tion.It is advisable, after a long runwith an experimental jet needlefitted, to check both spark plugappearance and condition of thetail pipe bore. In both cases 'white-ness' is a sign of weak mixture.Having obralned a jet needle whichallows the car to acceleratesmoothly up to maximum revs,is steady under part throttle con-ditions and is also satisfactoryat the top end, then consumptiontests can be carried out.These should be undertaken ingood weather conditions and ifthe standard fuel system is used(sometimes a separate gallon tankis fitted for this purpose), fill thetank to the brim, note the mileagecarefully and refill to the brim.This will give the exact quantity of

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fuel used.To obtain the best m.p.g. figureswithout sacrifici ng performance,these consumption checks shouldbe done at steady speeds, (say 30,40 and 50 m.p.h.), and also at topspeed; then if there is excessiveconsumption at particular pointson the needle then a closer settingcan be looked for. (See back ofthis book), bearing in mind whatpart of the needle is affected.Two last points to rememberare:-When going from weak to rich onthe setting it is usual to try adimension about 002" (two 'thou')smaller at a time, but when goingfrom rich to weak at a point on theneedle, it is advisable to go nomore than -001" (one 'thou')larger on the dimensions, unlessthere are signs of excessiverichness.If these methods are to be usedfor jet needle determination pleaseuse the utmost care whilst carryi ngout checks on the public highways-really such road testing requiresa test track.Size of Carburetter.An alteration in size of carburettershould only be necessary if thebreathing capacity of the enginehas been substantially increased.To improve the breathing willrequire possibly larger inlet valves,alteration to the head or ports, achange of camshaft or an increasein engine capacity.Polishing and lining-up the portsand increasing compression byabout one ratio is not reallysufficient [ustiflcation for increas-

ing carburetter size.If larger instruments are to befitted then the next size shouldbe used; it is very rare that anengine's breathing capacity isincreased to the stage where itreq uires an increase of two sizes.Remember if a larger instrumentis fitted to a power unit whichdoes not really merit this increasein carburetter size, the piston willnot reach its full travel-the onlybenefit achieved will be a moreimpressive underbonnet appear-ance!Piston springPiston springs are identified by acolour code and this can be foundpainted on the end coils of thespring.The range for carburetters up toand including 1,' bore size is:-2 t oz. blue. 4 t oz. red. 8 oz. yellowand 12 oz. green.It is best to use the red springbut if the carburetters are sus-pected of being on the large sizefor an engine then the blueshould be tried. Conversely if theinstrument is only just largeenough, a stronger yellow springmight be required.A correct strength of pistonspring will be one which allowsthe piston to reach its maximumtravel at the point in the speedrange where maximum power isobtained.In the paper on the S.U. Car-buretter given to the Institute ofMechanical Engineers by Mr. P.G. G. Knight, Technical Managerof S.U. Carburetter Co. Ltd., thereis a description of a simple

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piston height indicator which canbe used whilst the vehicle is inmotion. This device can be ex-tremely useful in determining,both piston spring and needleprofile by road test methods. (Seefootnote")It should be noted that the changefrom a medium spring (say the red)to a weaker one (blue), will havethe effect of weakening the mixturethroughout the range. The effectof going to a stronger one will beto enrich the mixture throughoutthe range.A way of getting a rough guide asto which spring to use is to referto the S.U. Leaflet AUC.9631. Thislists carburetter specifications forboth current and earlier models.Look down the list of vehiclesand find a power unit which givesabout the same power with thesame number and size of car-buretter fitted. This will give apiston spring/jet needle combi-nation which can be used as agood starting point. See alsoappendix 1.Carburetterair intakeThe way by which the air reachesthe carburetter intake can greatlyaffect the mixture requirements.In addition to this manometer device Mr. Knight '- I lsorefers to checking piston lift by means of a rod insertedin a hole drilled vertically through the suctionchamber cap.The rod is cut off flush with the top of the cap whenpiston is resting on the carburetter brid ge and istherefore at its lowest point. As the piston rises,it carries the rod with it and a simple measurementreveals the extent of lift. A device of this type isactually available on the market-the PSW toolset, manufactured by PSW Test Equipment (P. M.Schleyer) of Western Germany, and imported intothis country by Motor Books and Accessories, 33St. Martins Court. St. Martin's Lane, London W.C.2.Sets are available for S. U. carburettors and forStrom bergs, they cost 365 6d. As well as pistonlift, they permit immediate checks to be made ofjet centralisation, synchronisation of twin carbs,mixture strength and fuel level.

Removal of an air cleaner systemwill tend to weaken the mixturesupplied to the engine and theeffect will be greater at the topend of the speed range.The degree of weakening willdepend upon the type of air cleanerand this will be governed by howmuch restriction the cleaneroffers-the greater the restriction,the greater the weakening effectwhen removed. In general, oilbath type cleaners offer morerestriction than the paper elementtypes.Fitting ram pipes to the intakeflange of the carburetter(s) canalso affect the mixture require-ment (usually weakening the mix-ture slightly in the mid-speedrange). The effect on power curvevaries with type, and length.There is no simple formula for rampipe length, but in general a lengthof between 2 to 3 inches is used.The effect of these pipes is toboost power very slightly in themid-speed range.Jet needle profile.Two leaflets which are obtainablefrom S.U. Carburetter Co. Ltd., ortheir agents, are extremely usefulfor jet needle determination; oneis the Carburetter Specificationbooklet already mentioned andthe other is the list of needle sizes(AUC.9618). See Appendix 2.The book of needle sizes gives alist of diameters for each needlestarting with the diameter immedi-ately under th~ shank or head ofthe needle and working down thelength in increments of one eighthof an inch. The smaller the dla-

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1 ~ 1 2 ~ndia.I

~ ~~-~-- -~

-~ - -- -~ -

1st ..idling2nd L3rd rpick4th Iup&5th Icruis6th L7th rop8th spee9th L

10th11th12th13th

C E

I~- -~

- -. . .- - .ing

- . .d --- -- -- -

NB. The above bracketing applies1"for 1'4(H2 or HS2 )carburetters10

"089"085"'082"0795, .0777"'076"745

0735"'072"

"0710695"0682"'067"


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meter at any particu1ar point thericher the needle will be at thatpoint.To illustrate what the needledimensions in the book actuallyrepresent we will take an example,(a diagram of this needle appearson page10)the CE, list the dimen-sions and discuss which partaffects which driving condition.Referring to diagram (1) the firsttwo dimensions are given as1).. 089 2).. 085: these are theidling or datum positions and itis advisable when changing fromone needle to another to chooseone with the same idling dimen-sions.If this is not possible then bearin mind that if the new needle hasweaker or larger idling dimensions(say .089-.0855) the rest of theneedle will give slightly richerresults than suggested by thedimensions.If the idling dimensions are richeror smaller (say 089-0845) theneedle will give slightly weakerresults than one would expect.This is due to the alteration in thejet position required by the newidling dimensions. .The next four dtrnenslona.uovernthe pick up in top' gear fromabout 20 m.p.h. to 50 m.p.h. Theseare 3) 082 4) 0795 5) 0777 6) 076and are also the part of the needlewhich meters fuel for the partthrottle or cruising conditions. Acruising speed of 30 m.p.h. willlie approximately (depending on

size of carburetter) between thesecond and third dimensions onthe diagram; a steady 50 m.p.h.will occur around the fifth portion.Dimensions from the seventh(0745) to the ninth (072) affectthe top end full throttle conditions.The last three dimensions (with1f' diameter carburetters) do nottake part in the metering.Testing procedureWith the carburetter(s) correctlyset for mixture at idle conditions(see S.U. Service Literature) andthe engine oil and water at normaltemperatures, carry out a numberof acceleration tests and partthrottle tests.First accelerate from about 20m.p.h. in top gear to about 50m.p.h. If there is hesitation or apulling back, repeat test with thechoke pulled out about i". If thereis an improvement, make a notethat the third, fourth and fifth, andpossibly the sixth needle dimen-sions require to be a little richer.Now try driving at a steady 30, 40and 50 rn.p.h., if there is a slightsee-sawing action, try to cure thisby richening the mixture controlslightly.If weakness is suspected at thesecruising speeds then again thethird, fourth and fifth dimensionswill require richening. A similartest can be carried out for highspeed in top gear. Here it is veryimportant to ensure that there isno weakness.

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SECTION IIAdjusting and Servicing

1

4

5

1. Baffle plate.2. Inlet nozzle.3. Suction chamber.4. Carbu retter body.5 . Marks for replacement.

6. Damper.7. Damper washer.S. Chamber retaining screws.9. Direction of removal.

A. Remove the baffle plate from the inlet nozzle.B. Thoroughly clean the outside o f the carburetter.C. Mark the relative positions of the suction cham ber and the

carburetter body.D. Remove the damper and its washer. Unscrew the chamber

retaining screws.E. lift off the chamber without tilting It.

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A. Remove the piston spring and washer (when fitted).B. Carefully lift out the piston assembly and empty the damper oil

from the piston rod.C. Remove the needle locking screw and withdraw the needle. If

it cannot easily be removed. tap the needle inwards first andthen pull outwards. Do not bend the needle.

D. If a piston lifting pin with an external spring Is fitted. removethe spring retaining cirdip and spring. then push the lifting pinupwards to remove it from its guide. With the concealed springtype. press the pin upwards. detach the circlip from its upperend. and withdraw the pin and spring downwards. ..1

Ihf

21. Piston spring. 6. Needle.2. Alternative spring with 7. Piston lifting pin.

washer. 8. Circlip for pin.3. Piston assembly. 9. Spring for pin.4. Piston rod. 10. Alternative lifting pin.5. Needle locking screw.

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1 7

6 II 10I~ \ I I\~~w

31. Jet assembly. 10. GI~d.2. Pick-up link. 11. Washer.3. Link retaining screw. 12. Ferrule.4. Pick-u p lever retu rn spring. 13. Jet adjusting nut.5. Brass bush. 14. Spring for nut.6. Sleeve nut. 15. Jet bearing.7. Flexible let tube. 16. Brass washer.B. Float-chamber. 17. Jet locking nut.9. Carburetter body. 1B. Piston key.

A. Support the moulded base of the let and slacken the screwretaining the let pick-up link.

B. Relieve the tension of the pick-up lever return spring from thescrew and remove screw and brass bush (when fitted).

C. Unscrew the brass sleeve nut retaining the flexible jet tube tothe float-chamber and withdraw the jet assembly from thecarburetter body. Note the gland. washer. and ferrule. at theend of the let tube.

D. Remove the jet adjusting nut and screw. Unscrew the jetlocking nut and detach the nut and jet bearing. Withdraw thebearing from the nut. noting the brass washer under theshoulder of the bearing.

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4

1. Pick-up lever.2. Lever return spring.3. Lever pivot bolt.4. Double-coli spring washer.5. Spacer (alternative).6. Cam lever.

7. Lever spring.8. Pivot bolt tube.9. Skid washer.10. Cam lever spring location.11. Pick-up lever spring location.

A. Note the location polnu of the two ends of the pick-up leverreturn spring. Unscrew the lever pivot bolt together with iudouble-coli spring washer, or spacer. Detach the lever assemblyand return spring.B. Note the location of the two ends of the cam lever spring andpush out the pivot bolt tube or tubes. taking care not to losethe spring. Liftoffthe cam lever. noting the skidwasher betweenthe two levers.

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5

.'1. Float-chamber. 7. Float assembly.2. Retaining bolt. a . Float hinge pin.3. Float-chamber lid. 9. Float needle.. . . Marks for replacement. 10. Needle seating.5. Lid retaining screws. 11. Alternative float-chamber.6. Lid gasket. 12. Alternative spacers.

A. Slacken and remove the bolt retaining the float-chamber to thecarburetter body. Note the component sequence with flexiblymounted chambers.

B. Mark the location of the float-chamber lid. Unscrew the lidretaining screws and detach the lid and Its gasket, completewith float assembly.

C. Push out the float hinge pin from the end opposite Its serrationsand detach the float.D. Extract the float needle from Its seating and unscrew the seating

from the lid, using a box spanner 338 In. (858 mm.) across theflats. Do not distort the seating.

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61. Throttle disc.2. Carburetter flange.3. Marks for replacement.4. Disc retaining screws.

5. Throttle spindle.6. Tab washer.7. Spindle nut.8. Lever arm.

NOTE.-Before reassembling, examine all components for damage and/or wear.Un.ervlceable components must be renewed.

B

A. Close the throttle and mark the relative positions of thethrottle disc and the carburetter flange.

B. Unscrew the two disc retaining screws. Open the throttle andease out the disc from its slot in the throttle spindle. The disc isoval and will jam if care is not taken.

C. Tap back the tabs of the tab washer securing the spindle nut.Note the location of the I!!ver arm In relation to the spindle andcarburetter body; remove the nut and detach the arm.

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5 -- - - 3

1. Piston rod.2. Transfer holes.3. Needle.

"'. Needle locking screw.5. Alternative needle.

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8

A. Examine the throttle spindle and Its bearings In the carburetterbody. Check for excessive play. Renew parts as necessary.

B. Refit the spindle to the body. Assemble the operating lever withtab washer and spindle nut. to the spindle. Ensure that whenthe stop on the lever is against the abutment on the carburetterbody. I.e. throttle closed position. the countersunk ends of theholes in the spindle face outwards. Tighten the spindle nut andlock with the tab washer.

C. Insert the throttle disc In the slot in the spindle in its originalposition as marked. Manoeuvre the disc in its slot until thethrottle can be closed and fit two new retaining screws. but donot fully tighten. Check visually that the disc closes fully. andadjust its position as necessary. With the throttle closed theremust be clearance between the th rottle lever and the carburetterbody. Tighten the screws fully and spread their split ends justenough to prevent turning.

.!

A. Examine the float needle and seating for damage. Check thatthe spring-loaded plunger In the end of the plastic-bodiedneedle operates freely.

B. Screw the seating into the float-chamber carefully. Do notovertighten. Replace the needle in the seating. coned end first.Test the assembly for leakage with air pressure.C. Refit the float and lever to the lid and insert the hinge pin. Checkthe float level as described in item 15

D. Examine the lid gasket for re-use. Assemble the gasket on thelid and refit the lid to the float-chamber in the position markedon dismantling. Tighten the securing screws evenly.

E. Refit the float-chamber assembly to the carburetter body andtighten the retaining bolt fully. making sure that the registerson the body and the chamber engage correctly. 9

10

A. Refit the piston lifting pin. spring. and circllp.B. Examine the piston assembly for damage on the piston rod and

the outside surface of the piston. The piston assembly must bescrupulously clean. Use petrol or methylated spirit as a cleaningagent. Do not use abrasives. lightly oil the outside of thepiston rod.

C. Clean Inside the suction chamber and piston rod guide usingpetrol or methylated spirit. Refit the damper assembly andwasher. Seal the transfer holes in the piston assembly Withrubber plugs or Plasticine and fit the assembly to the suctionchamber. Invert the complete assembly and allow the suctionchamber to fall away from the piston. Check the time this takes.which should be 3 to 5 seconds for HS2-type carburetters of 11

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in. (3175 mm.) bore. or 5 to 7 seconds for larger carburetters.If the time taken is in excess of that quoted. the cause will bethick oil on the piston rod. or an oil film on the piston or insidethe suction chamber. Remove the oil from the points indicatedand re-check.

D. Refit the needle to the piston assembly. The shoulder or loweredge of the groove must be level with the bottom face of thepiston rod. Fit a new needle locking screw and tighten. Invertthe suction chamber and spin the piston assembly inside it tocheck for concentricity of the needle.

E. Check the piston key for security in the carburetter body.Refit the piston assembly to the body and replace the pistonspring over the piston rod. Fit the suction chamber and retainingscrews. Tighten the screws evenly.

11

A. Refit the Jet bearing, washer. and locking nut: do not tightenthe nut. Refit the jet in its bearing and the flexible tube to thebase of the float-chamber without the gland and washer.

B. Centralize the Jet as described in item 13C. Withdraw the Jet and tube; refit the spring and Jet adjusting

nut. Fit the gland washer and ferrule to the flexible tube. Theend of the tube should project a minimum of - I e - In. (48 mm.)beyond the gland. Refit the jet and tube. Tighten the sleeve nutuntil the neoprene' gland is compressed. Overtightening cancause leakage.

D. Refit the damper and washer.

12

A. Reassemble the plck-u p lever. cam lever. cam lever spring. skidwasher, and pivot bolt tube or tubes In the positions noted ondismantling.

B. Place the pick-up lever return spring in position over Its bossand secure the lever assembly to the carburetter body with thepivot bolt. Ensure that the double-coil spring"~her or spacerfits over the projecting end of the pivot bolt tube.

C. Register the angled end of the return spring In the groove inthe pick-up lever. and hook the other end of the spring aroundthe moulded peg on the carburetter body.

D. Fit the brass ferrule to the hole In the end of the pick-up link.Relieve the tension of the return spring and fit the link to theJet with its retaining screw. When finally tightening the screw,support the moulded end of the jet.

E. Refit the baffle p late to the float-cham ber lid nozzle.20


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JET CENTRE ING

13The piston should fall freely onto the carburetter bridge With a click

when the lifting pin is released with the jet In the fully upposition. If It will only do this with the let lowered then thejet unit requires re-centrlng. This Is done as follows:

A. Remove the jet head screw to release the control linkage.B. Withdraw tjte Jet, disconnecting the fuel feed pipe union in the

~oat-~er.; jln'd removing the rubber sealing washer. Remove~ . ~ ietl~rclnfspring and adjusting nut.C. Replace the jet and Insert the fuel feed pipe connection into the

float-cha'iiiber.D. Slacken the jet locklns nut until the assembly is free to rotate.

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14

A. Remove the piston damper and apply pressure to the top of the (piston rod with a penel I.

8. Tighten the jet locking nut keeping the jet hard up against the ~-~jet beari ng.

C. Finally check again as In item 13.D. Re-fit the let locking spring and adjusting nut. Before replacing "_, .>:

the fuel feed pipe into the float-chamber. fit the rubber sealing "'--c---washer over the end of the plastic pipe so that at least - t \ In.(48 mm.) of pipe protrudes (see Inset). Reassemble the controls.Refill the piston dampers with the recommended engine oil(see Item 26 ).E .

Float-chamber fuel level

A. Remove and invert the float-chamber lid.B. With the needle valve held In the shut-off position by the weight

of the float only. there should be a 1to * In. (32 to 48 mm.)gap between the float lever and the rim ofthe float-chamber lid.C. The float may be set by bending at the crank. 1522


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ROUTINE CLEANING

16

A. At the recommended intervals mark for reassembly andcarefully remove the piston/suction chamber unit.

B. Using a petrol-moistened cloth, clean the inside bore of thesuction chamber and the two diameters of the piston.C. Lightly oil the piston rod only and reassemble as marked.D. Refill piston damper (see item 26)

231,


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SECTION IIITuning Multi Carburetters

The Type HS Carburetter1. Jet adjusting nut.2. Jet locking nut.3. Piston/suction chamber.

4. Fast-Idleadjusting screw.5. Throttle adjusting screw.6. Piston lifting pin.24


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rI

17

A Warm engine up to normal temperature.B. Switch off engine.C. Unscrew the throttle adjusting screw until it Is just dear of its

stop and the throttle Is closed.D. Set each throttle adjusting screw iof a turn open.

A. Mark for reassembly and remove piston/suction chamber unIt.B. Disconrtect mixture control wire.C. Screw the Jet adjusting nut (1) until the jet Is flush with the

bridge of the carburetter or fully up If this pOSition cannot beobtained.

D. Replace the piston/suction chamber unit as marked. 18E. Turn down the let adjusting nut (1) two complete turns.25


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19

7

adOSlacken both of the clamping bolts (7 ) on the throttle spindleInterconnections.

B. Disconnect the jet control interconnection by slackening theclamping bolts (8).

\['4.\" ~/

20

~~A. Restart the engine and adjust the throttle adjusting screws on

each carburetter to give the desired Idling speed as indicated bythe glow of the Ignition warning light.S. Compare the Intensity of the Intake 'hiss' on all carburetters

and alter the throttle adjusting screws until the 'hiss' Is thesame.

26

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,-",~, ,.~

'''. 21A. Turn the jet adjusting nuts (1) on all carburetten up to weaken

or down to rlchen the same amount until the fastest Idling speedconsistent with even running is obtained.

B. Readjust the throttle adjusting screws (5) to give correct Idlingif necessary.

rich

..~-.--T I M E

A. Check for correct mixture by gently pushing the lifting pin ofthe front carburetter up n In. ('8 mm.) after free movement hasbeen taken up. The graph illustrates the possible effect onengine r.p.m. Readjust the mixture strength If necessary.

B. Repeat the operation on the other carDuretters and after adjust-ment re-check since they are all Inter-dependent.

C. Item 25. shows the correct type of exhaust smoke.27


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23A. Set the throttle interconnection damping levers [!) so that the

link pin is 012 in. pO mm.) away from the lower edge of the-.fork (see Inset). Tighten the clamp bolts.

B. With both [et levers at their lowest position, set the jet inter-connection lever clamp bolts (8) so that both jets commence tomove simultaneously.

A. Reconnect the mixture control wire with about n-In. (16 mm.)free movement before It starts to pull on the jet levers.

B. Pull the mixture control knob until the linkage Is about to movethe carburetter jets, and adjust the fast idle screws, compar-ing the Intensity of the air intake 'hiss' to give an engine speed24 C. ofabout 1,000 r.p.m. when hot.Refit the air cleaners.

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25

haust smokeh on ex. f mix tu re st re ng d colou rless.The effe't 0 I hy misfire. anI note, sp asIrregu ar note. . hRegular and eve~mical misfire. blaekls Regu lar or rhyt

TOO WEAK:A. CORRECT:B. TOO RICH:C.

29


33/58

26Finally top up the piston damper with the recommended engine oiluntil the level is tin. (13 mm.) above the top ofthe hollow pistonrod.

NoteOn dust-proofed carburetters, Identified by a transverse hole drilledin the neck of the suction chambers and no vent hole in thedamper cap. the oil level should be tin. (13 mm.) below the topof the hollow piston rod.

30


34/58

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37/58

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39/58

A works Mini Cooper5: within the enginedepartment lurk thesetwin 1! in. SUs inplace of tne standardItina. carbs. Note thecarb bellmouths andthe re-routed oil brea-ther pipe aU veryneatly done.

Below: these twin 1ins. SUs were fitted toan MGB tuned by Bill Nicholson of North.ampton. Together with other mods theyhelped propel it to a 0-60 time of 8.8 sees.

Above: twin Itins. SUs as supplied by Nerusfor the Imp. ofher well known tuners sell thistype of conversion for about 30 and resultsare geherally good. Below: HS6s (Ii ins.) as fitted to the MGC; its sister the MGB uses thevisually similar 1! ins. twin HS4 carbs.

36


40/58

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41/58

090 JET NEEDLESAAA

APPENDIX 2

BO

AS I AA AS AC ACl AD AE~I'~~~~~~085 -0845 -085 085 084 085 085-0826 000 080 081 -082 '082 081-080 I '0767 '0785 -080 -080 '060 '078-0782 ions '0768 '0783 -0783 0780 0763-0765 I 071 -075 0765 -0765 0760 ,075407.0\6 0689 -0731 -0746 0746 0740 0745

:~;~ 1 I :~!!~~;~~~;~:~;: :~;~o:~;~~0694 '0614 0688 '0694 G6"" '0680 '0718'0676 0591 -0671 '0676 '0676 066 071'066 '0566 0657 066 066 -06


42/58

090 J ET NEED LES~I~I~ BY BZ CSl CT CU CW CX CY CZ--- --- I------ -- ------ --- ---089 089 089 088 089 089 089 089 0 8 9 089 089 089 0 855 085 085 084 0843 08S 085 -085 085 085 085 085 0818 O B O S , [1827 0805 OB, '081 '081 -0825 'OB' 'OBI - O S O 0827-079 en ' OB I - 0775 '0752 077 '077 080 ,079 '0796 '076 '0806'0765 '075 '0792 '0745 0719 073 0738 -orrs ,078 '0788 '0738 ,0785'0712 0735 07n ons 0686 049 0706 0735 crt 078 - 0715 07 ..5-0718 072 - 076 0709 0453 045 0475 0715 0763 0771 -0695 07270693 0705 075 069 0611 0615 060 070 0754 0763 - 0 68 0710~7 0687 -07. 067 059 '05B '06' - 0683 '07-45 0755 -067 ,069],0645 '067 073 0653 '056 '05"16 '058 '0665 ,0736 'OH8 '066 '0675'061 ,0655 '071 0635 '053 051 0547 0 6 < 4 7 0717 '074 0655 0657'O5~6 '064 071 -062 050 0475 0515 0630 0718 -073 - 0 65 06 .. 0 57 060 0 -47 'OH 0485 0610 06..5 -0625- ---------------------------------------C CA CB CC CO CE C, 01 02 03 04 06 D7 D8

c---- --------- ------------------------------089 -089 OB9 089 089 089 089 089 .08 'J 089 089 089 089 -0890&15 0855 OB5 085 ,08' ,08' 085 085 085 085 - o a s s 0855 -0855 085,08' 084 0805 08' 0815 081 -083 081 - 0815 083 0825 0815 0817 :0817077 0815 077 ,078 ,0775 -0795 -0805 0801 0800 081 0B05 0805 0795 07850742 081 '0745 '075 '0735 '077T '0787 '0793 '0795 '080 '079 '0793 '0785 '0767-071 '0807 ,0725 '070 '076 '076 -0767 0785 0790 -0794 '078 0785 ona '076'0683 '0803 '07' -0698 '069 '0745 '01'47 0776 ,0785 '0785 '0767 '0776 - a r r -075 066 0803 0695 067 -0678 01)5 0717 -077 0780 -0779 0756 on 'O76~ 071-0635 0803 068 044 0666 -072 -0707 0764 - 0 775 0772 0715 0764 0759 073061i 0803 0&65 ,06' 065-4 - 071 0687 - 0759 0770 0764 - 0733 -0759 0751 -0720594 0803 065 058 0643 -0695 -0667 0752 0765 -0757 -0721 -0751 OH7 -071 0 575 '0803 '0635 - 055 '063 - 0682 ,0647 '0718 - 0 760 -075 '071 '0718 - 074 070'056 '0803 '062 052 061 '067r----------------------- ---------------------CG CH CJ CK CL CM CN D9 DA DB DC DO DE DHr----- --- ------------------------------_---090 '090 090 '090 '090 '088 '089 089 089 089 089 089 '089 '089os. '081 '084 '084 '084 '08. - o a s '0851 08. 085 '084 '0855 '0855 '085,08' 0805 - 0 815 '08' 080 0805 -0812 0B25 082 081 082 0835 0825 0821-079 0762 0795 079 0775 0775 078 0806 0 8 0 080 0B05 0817 0802 080-0765 0767 1 0775 -0775 - 0 76 074 - 015 0791 0788 078 0796 0798 0771 -0775- 0 75 '07li 0761 077 075 0719 072 0778 078 1 - 0753 0794 0781 0 7 - 4 5 074-0735 0756 - 0 7 4 7 0766 '0746 '070 '06. 0764 '0780 0717 '0792 '0767 0734 071'0722 '0752 -07H -0762 - OH 2 -0685 -0665 -075 '0776 '0674 - 0 7 < J O -0752 -0729 -071'0707 '07'47 -072 '0757 0737 0668 064 0736 0773 062 0787 '0740 -0723 070,069] '01'43 -0705 -075) 0733 0652 061 -072] 0769 0557 0785 0730 -0717 -069-0679 -0738 -0691 07.9 0718 -0635 060 ,07' -0765 0-493 -0783 0720 07'1 068-0664 -0123 0677 0745 -072-1 I 062 058 0696 ,076' -0-43 0780 0710 0707 067065 073 066' 074 -071 060 056 0368 066----------------1-- ---------------------CO CP CP4 COl CR CS CS' DJ DK DL OM ON DP DOl-- --------- --- --- --- --- --- --- --- ---------089 089 088 088 088 089 089 089 089 -089 089 0885 089 -089085 - O S S 0852 0851 - 0 85 2 -085 085 085 085 085 084 085 085 - 0 8 5,08' 0813 -0825 0825 083 0822 '081 -0822 0817 '082 081 082 '081 08150787 '0793 -079 '0798 '0805 -0792 '077 '0795 -0787 0795 0791 '080 '0777 '0785'0765 0775 '0757 0768 -078 0765 '073 0765 -0755 '077 0780 -0782 075 07607


43/58

'090JET NEEDLESDR O S D T DU DV OW DT E . .Q ER ES ~I~ EV-- ------I- ---------'088 089 0 8 8 0 1 1 9 089 089 .08') 0 1 1 9 0 8 9 0 8 9 '089 '088 089 ' 090' OS 5 085 08-1 O S 5 064 'O S 5 O S 5 0 8 5 0 8 5 0 8 5 0 8 5 0 8 6 ' OS 5 ' OS 5 5090 -080S O S I 0 8 1 0822 - 0 815 0 79 0 835 0817 0 833 -0 818 0815 0 8 2 5 , 0 815-0769 0776 078 on5 O S I 0795 -0 765 0 8 15 -0 78 5 -0 8 1 -0 79 0 8 2 5 0 8 0 5 - 079-0735 -0759 -076 0755 0792 -0780 074 -0795 -076 'On? - 0 77 0 8 0 3 0 785 -075'0705 -074 -074 'OH - 0781 '0765 -0715 'ons '0746 '07-4 - 0 7 5 5 0 7 81 - 077 -07lS-0675 '0725 '0723 073 078 '0752 '069 '0755 '0732 '0725 0718 - 0 773 0755 '07050 65 0 71 0712 0 72 078 074 0(,65 075 , 072 0712 -071 -077 0 7~5 -0 6 '0635 06 '5 07 0 . 071 -078 - 0 7 28 0613 075 -071 0 7 06 -073 071 ' 07~ -068-0627 068 -0705 070 078 0714 - 062 075 -070 -0 70 6 -0 73 -0 77 -0 7~ -0 67-0618 0 67 -07 03 -069 - 0 7 8 -0 70 -0 61 0 7 ' -0 6' - 07 06 -0 73 -0 77 -0 7~ 066'0 60 8 '0 60 '0701 , 0&& 078 ,0686 ' 060


44/58

,090 JET NEEDLESfO FP FQ FR FS FT FU GN GO GP Go. GS GT GU----------------- -- ------- -------- ---089 089 8 - 089 0 089 089 DB9 089 089 -089 - 089 089 089 089 089085 CBS5 0850 085 .Q8S DB5 085 0855 086 -085 '085 '085 '085 -085501118 0826 ' 0820 '081 0827 '082 '082 -0835 -0815 ' 080 '082 '0815 '082 '083-0785 0799 07.5 '078 081 07.5 08 0 -081 -0815 070 07' 0785 07.5 '0805-076 0778 0774 075 0785 om -078 ,078 -0792 075 077 -0155 077 0775.07-45 0762 ,0758 on8 076 0753 0763 -0755 -0777 0725 07' 0725 0 7 < 1 5 07-45- o m 0754 0745 0705 015 0738 075 -ons ' 07&5 0696 073 070 011 0705-071' 0750 -0735 0&85 074 0728 - 074 070. -0755 ' 0666 '071 '0075 '0675 -007'0727 '07'} -0725 '0663 -073 'on1 '073] ,0075 -0750 -0036 06. 0650 '0640 '0635-on5 0735 -0715 '0642 072 or z '0728 -0650 -0715 ' 0606 '067 '0625 cx,05 060-O7l3 '0728 -0705 0622 071 -on 072. -Q6lS 0140 0577 065 060 0570 05650721 0720 0695 060 070 -on 0714 -060 0735 -055 063 - 0575 0535 053057S -0730 052 061 -055 050- ------------------ I-- ------------------FV fW fX fY fZ GV GW GX GY GZI-- ---------------------------------------089 . . . . -089 - D 9 O 089 -089 -089 089 089 089085 085 -0855 085 085 -08S5 ,08' 0855 0855 '085'083 081 -0827 -081 (lI1] -0836 083 0835 0832 0835080 0775 -080 -on5 0789 -082 '080 '0815 0812 0811em 07. -0775 '075 077 - 08 04 '077. '07'5 '079 -0788' 0715 0725 -07' 073. 0756 - 08 0 076 0775 077 -0765,0715 070 0715 on 07.8 -0796 07 ..5 -0755 0753 0142-()686 ,0675 -068 071 074 -0793 073 -0735 07. -0720658 0665 -0653 -()70 -0735 -0793 0715 -on ,07) 0698-0647 0665 -0617 -068 -073 -0793 070 070 ,072 '06760636 0665 '060 -066 -0725 -07'3 0&85 -068 ' 071 '0655'0625 066. -05' - 0 6 . - 072 '0793 '067 -066 070 0631'061. 0665 -058 -062 -0793 066 064 06. 061I- -----------------------------------Gl GA GB GC GD GE GE,R HI H1 H. H' HA H8 HC1- ---------------------------------------0875 089 089 ' 089 089 -089 ' 089 - 088 -088 -089 '08' 089 '089 '089- O 8 l 5 -085 -085 085 -085 -0815 '085 -085 085 085 0855 085 085 'Q8S'-oet 0795 -082 083 0833 -081 'OB25 081 081 081 082 - 0 8 2 5 0825 0811-0785 '077 0795 - 08 0 -081 0793 0795 0792 07.2 - 0778 -080 ,080' 0805 08050765 074 0771 -0773 079 0766 07& -0762 0761 -076 078 ,0785 0785 0785 0745 - 0715 -0748 -0740 -0766 0739 0725 -0735 '0715 '0741 ,076 077 0776 -077-07lS 069 -073 -0705 0705 '0712 '069 0707 'W07 on 'OH 0756 -0764 07550705 067 0711 0665 -07


45/58

090 JET NEEDLES---------~--~------~---------I~-I--I---89 I085081078'07S2'0729,070206B,065)0627 . I'060'05.~ - - - - _ 1 _ _ -_ __~I~I~~ __'089 '089 089 '088 088085 081 085 -oe s -oas081 0801 081 080 030079 0772 -078 -077 -0765077 07.5 07!! -0735 073075 '0722 -073 -070S '071'0735 -0702 '0702 '068 0798en. ,0675 0675 0658 -0678071 -065 065 0636 066070 -0625 -0625 06t) 064,069 060 060 -059 062068 '0575 '0575 '057 060

-055 '055 '055 058---.----------M H1 Ml H5 H6 H7 M8-------1--------------089 089 -089 089 089 089 089'0855 '085 '085 085 085 'OB5 086'0832 '0817 '0817 -0817 0817 '0822 '0827,0808 0796 080 0792 0801 0807 ,08120785 -sm 0785 0776 -0786 -0792 0797.07U 0757 0765 -076 077 0777 0792.07


46/58

pO P6 1 I ,J090 JET NEEDLES

I--~--~----------TB I

-088 - 0 8 8 -088 089-O &IS 0 8 4 S -0845 - 0 8 5081 0 81 - OS I '08220785 '0775 077 O S 0 70755 -07)8 07 -46 0795-073 -070] 0715 0 7'-070 - 067 0684 07850075 0638 0653 0 7806~5 -0603 '062 077506175 057 '059 0 77059 ,054 - 056 07650562 0505 0 53 -076,0535 '(H71 050------~ ------------

RS W3 WW WXI

- o s s- O S S- OS I079'075'073'071-0698'0678- 06 '- 062 08575 ! ' 0869070 -070 0712 0762 0786 .08tl8 '079 '072 '080 -080 OS45 085 ,086'20668 -067 -0695 0731 0757 0782 ,0768 '06'15 '079 ,079 08' ... 5 0859063. .. . . D -070 0727 0755 ,0713 .. 7 078 078 . . . 08. 08550606 062 o)~ 067 '070 '073 on . . . . 077 077 . . . OS 4 'OS55'0579 '060 '062 . . . . -067 0702 070 0&2 -076 -076 OS. 08 -0855'0552 '057 '060 . . ., . . . . -0675 068 O S9 -015 -075 '084 - O S 4 -0855053 -055 058 '05S 061 -065 . . . . ,057 -074 -074 084 084 '0855--------------------- ---------------------RA " 8 RC ,,0 RE R' RG SH 5j SK SL SM SN SO-------------------- ------------ -- --- ---'100 '099 099 099 '0" '100 100 099 099 099 099 099 099 100'09' '095 -0916 095 -095 095 095 -0952 095 0954 ,09' ,09' 095 09.'088 '0907 090 090 - 09 2 -090 '0905 0917 091 093 092 0915 '0915 092083 -O S66 ,0855 0865 -089 0863 087 0ll85 - 0895 '090 -089 '088, ,088' 08'1- 0785 08l5 081 0835 0856 ,0825 '0836 '0865 'OS75 0861 0861 0855 0865 OS.0753 -0784 01&5 'OS1 0805 '0788 0802 -0815 0855 0833 0833 08l5 'OS45 083-0712 -074 '072 '079 ,0753 -075 ,0768 082 08]5 080 080 0795 0835 0B04'069 ,070 '0671 077 ,0112 0712 0732 0793 ,0815 077 017 0765 082 0778'0658 ,0657 0627 0757 0670 0675 -070 077 0791 074 07-4 0135 080 075' 0627 - 0615 0583 07 - 4 2 0628 '06]1 0665 ,0743 '077 -0714 -0714 071 -078 ' 07430595 0575 05)7 073 0587 060 '0630 '0722 075 -0695 '0695 . . . . 0765 0731'os,. 0531 0491 0715 -OS" l ] 057 060 ,070 073 0676 .. 7. 067 -075 073-053 0..9 0446 '0703 0501 ' O S 4 057 068 071 065 ... s 065 0 7 < 4 0721'050 045 040 069 0460 -051 -051 066 06' 063 .. 3 073---I- --------------- ---------------------RH ., RJ RK I .L RN RP 5P 5Q SR 55 ST SU SV--------- ------ ------ ---------------------'100 099 100 100 100 09. -0" 09. '100 099 099 099 09. 099'095 - 09 5 095 ,095 I 095 095 -095 095 095 095

I09"5 095 ,09' 0955

'0915 '0911 0910 '0915 0910 'O'J2 0905 0915 0915 092 0905 ,0925 0992 092]' 0 878 '08S1 087 '088 'OB9 009 087 0892 088 089 086 0895 0868 os.OS. .6 0846 0841 aSH 096 0851 ,08' 0871 -0851 'OB6 '084 '087 08H 0867-0813 0804 -0918 0830 0835 0908 -08n '0852 '.. 3 '083 080 -0852 0802 -084,-079 -0763 -0792 0805 -0810 -076 082 '083-4 -0812 0804 -0755 0831 -0761 0818075 -0712 076& -7080 0785 -0121 -0815 -0810 079-4 0778 0115 0805 0728 079on 067 -0740 -0756 0760 0688 -080' 0786 -0775 075 -0655 0787 '06' - 0755069 '0605 '0714 '0732 0735 -06S1 080 -0762 - 0757 -07-43 059 -077 0&55 -072'06' -O S67 0688 -0708 071~ 0617 -07904- 0138 - 0738 -0737 -0535 -0753 .. 2 0685'063 0525 0662 -0683 0685 -0581 0786 -07H 0719 -073 -0185 0737 0586 0665060 -049 "30 . . . . (;660 -05-47 -0778 '069 '070 0722 045 071 OSS2 -0635057 -0610 -0&35 0635 -0510 -077 . , . . . 068 0715 042 069 -0518 -0604---i-------I------- I- ------------------RR RU RV SW 5X 5Y 5Z----- ------ --------- -------------099 '100 -100 099 -099 099 099095 095 095 0955 '095 -095 '0945'0922 09' 089 '0925 '0902 -091 0903-0895 06.4 084 '08S 0968 'OS75 0858086 081 -081 OB6 08' -0855 0837 o s o a 0785 0785 -OB4 0808 OS25 0798'076 0756 0755 082 -0774 -078 ,075]'0721 073] 073 0795 -0744 075 -07070688 071 070 077 -0713 069 -064)0651 0688 -067 0745 068' 0'3 05700617 06. 0 6 < 4 5 072 0657 -0575 0508'0581 063' 0618 0695 063 0525 -0


49/58

TA TD TE

100JET NEEDLESZ8

099O'J5

099O'J5

.O'J_O'J5

TC.OJjO'J5

'0915 '0915 -0915 '0'20882 089 090 -08950867 'OS7 '097S 0870851 085 0845 08370831 -0832 0803 0805'0805 '0825 -077 '076

TF

099095

TG. 0 ' J9O'J6'0925 '0922 -0'108-089 '0895 -08930855 0878 0878032 0962 -08630782 ,0847 0848'OH8 '08]7 0825

'0787 '0815 '073 ,0715 -0711 0827 074one 0805 ,0678 '067 '069 '0818 -065-0753 0795 0631 -0625 -06-15 OB12 055-0737 ,0785 'OS85 058 061 0806 -0"'90710 0775 0538 0535 0575 0800 0-4"-0690 -0765 '049 049 054 C794 - o - o

TKJ TL TM TN TO099 099 099 099 -099 099 099095 095 095 095 0945 095 ,0955,092 092 '091 092 091 092 0920895 '090 089 '089" ,0137 0893 090-0877 0885 '086 0867 '085 '0065 '087508 & 0B7 0835 0EH2 ,082 '0845 '0856084S -086 -081 0811 078 'OS] 0836084 0855 0793 0785 073 ,082 0819DB3DB2DB108007_078

'01:145 0776 0775 0665 'OS1-0835 -0759 077 -060 -080-0825 '01'46 077 -0535 ,07'1-0815 -0733 077 -050 '0780805 -c n 077 0


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125 JET NEEDLESUG UH UI UI UK UL UM VA VB VC VO VE VF VG

UVA UV. UVC UVO UVE UVF UVG---------------------12. n.. 12-4 12-4 124 124 124 ------ --- --- --- ------1205 1205 1205 1205 1105 1205 12OS 1 2 < 1 124 121 114 124 124 12.116 1165 1171 1165 116 1173 1165 '1188 1188 1188 11B


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125 JET NEEDLES15 J5 45 50 59 60 70U15 UJS U"S usa US9 U60 U70------------ ---------11.. 11.. 114 114 114 -12-4 llSlll '123 'lll 117 '116 117 '119116 116 '116 111 111 -III '113109 109 109 100t 106 100t 1085100 100 101 099 101 099 10-4'092 '092 '094 '092 096 '094 0995. o e . . 085 089 '086 091 089 095076 078 082 080 087 . o e . . 0905067 -071 076 073 083 0795 '086059 '064 ',070 '068 079 '075 '081051 057 064 062 '075 -070 07700t2 050 057 056 071 065 072034 0-42 051 050 -()67 '060 068025 035 '0-45 .~ -()63 055 063'0]8 -059 050 '059---------------------

74 75 76 78 79 01U74 U75 U76 un U79 UOI---------------------124 '125 '124 '124 114 111117 119 117 117 1178 lll112 113 111 -112 '1147 '1175108 '1087 '109 '109 1115 '111510-4 105 -lOSS '107 loe.. 1065100 -1101 10ll 10-4 1053 1015097 '097 099 101 10ll 097'094 '09] '0958 0978 0991 092090 '089 0924 '094 096 '087087 0 8 5 -0891 091 093 082. o e . . 081 -()86 088 090 -0775-OS1 '077 '083 085 '087 0725'078 073 080 082 084 0675076 069 078 080 082 -()6]071 065 076 078 080 058072 '07-4 '076 078

NOTE: Numbered Serie., 15,.hank. 'US.rie. 1'125 .hank

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TIIIiI

I . ,

AN G LO AME R IC ANElectr ical & C arburet tor S ervices Ltd .134 N orwood Road,London , S .E .2 4 Tel: 01-6744477

REPLACEMENT S.U. CONVERSIONSReplacement downdraught carburetters Prices from 5 gn5.ZENITH - SOLEX- CARTER -WEBER -STROMBERGFORFURTHERDETAILSFILL IN THISFORM ANDPO ST TO :

NAMEADDRESSMAKE OF CAR, MODEL & YEARTYPE OF CARB FITTED...

WESTE.RN SERVICES (BRISTOL) LTDShaftsbury Buildings . Kingsland Road Tel: 0272 551558St. Philips . Bristol 2r-------------------,IIIIIIIIIII N=e'__ ~-------------I Addre _II _I s Colortune, 66 Royal Mint Street, London, E.1. Tel: 01-480 7561~ ~

T h e s i m p l e s t th~ i n t h e w o r l d tolower th e cos t O f m o t o r i n gThe Colortune Diagnostioplug makes it easy to correctfaults and achieve optimumperformance on any car.A recent survey showed it couldsave 15%on fuel costs.I would like to read what Motor,Engineering, Motor Cycle and Fordwrite about Colortune.

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Date post:	09-Jul-2015
Category:	Documents
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