typical s.u. h type carburetor...

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Carburetter Assemby - frontBody Assembly Pin - piston lifting Spring- pin Circlip- pinUnion- auto ignitionChamber and piston assemblyScrew-needle lockingCap and damperWasher (fibre) AUC 4900Spring- piston-redScrew-chamber to bodyWasher-top bearing AUC 2122Bearing- topWasher- gland (cork) AUC 2120Washer- cup (brass) AUC 3307Spring - gland AUC 3248Jet- thermo includedBearing- bottomWasher- bottom bearing AUC 3233Screw- adjustingRing- sealing (cork) AUC 2118Ring- sealing (aluminum)Nut- jet sealingWasher- end cap AUC 3159Cap- endNeedle- jetSpindle- throttleDisc- throttleScrew- discLever- throttle stopScrew- adjustingSpring- screwPin- taperLever- throttle stopBolt- leverWasher- springNut- boltChamber- floatBolt- banjoWasher (Fibre) AUC 5027Washer (Brass) AUC 5026Washer (Fibre) AUC 2130FloatLid- float chamberGasket- lid AUC 1147Float Needle and seat 6151Lever- hingedPin- hinge AUC 1152Nut- capWasher (aluminum) AUC 1557Washer (fibre) AUC 1928Bolt- banjoWasher (fibre) AUC 2141FilterBody- thermoJet- acceleratorNeedle-Spring- needle- greenShield- dustFinger- springScrew- fixingWasher- springSolenoid Assembly Plunger and valve Spring - conical Plate- spring locating Cap- end Strap- securing Screw- clampingCasting- pipeBolt- casting to thermo bodyWasher (fibre) AUC 2141Washer (fibre) AUC 4753Washer (fibre) AUC 4751Part Numbers listed ^ are included in

rebuild kitsPart Numbers listed ^ are included in

rebuild kitsTypical S.U. H Type Carburetor -Thermo

FLOAT CHAMBER FUEL LEVEL

(A) Remove the float chamber lid and invert it. (B) With the needle on its seating insert a 11.0mm (7/16”) diameter round bar between the forked lever and the lip of the float chamber lid.(C) The prongs of the lever should just rest on the bar. If not, carefully bend the lever till they do.

On 1 1/4” carburetors the drop time is 3-5 sec-onds. All larger carbure-tors have a drop time of 5-7 seconds. Throughly clean the piston, dashpot chamber, and plug de-pression transfer holes. Fit nut, bolt & large flat washer to one dashpot se-curing flange & measure time piston takes to move length of chamber.

Depression Holes

Large Washer

PISTON DROP TIMES