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Section 10 FUEL SYSTEMSubsection 04 (CARBURETOR)GENERALThe following illustration shows which part of thecarburetor begins to function at different throttleplate openings.14522F01F13A63VIEW FROM AIR INTAKE OPENING1. Throttle plate openings2. Throttle plate closed3. Throttle plate wide opened4. Low-speed screw5. Pilot jet6. Main jet and high-speed screwThe carburetor is equipped with a fuel acceleratorpump.The fuel accelerator pump is linked to the throttlevalve via a linkage.A metering jet in the fuel inlet hose controls fuelflow to the pump.A check valve on the fuel outlet hose helps toprime the system.REMOVALTo remove carburetor from engine, proceed as follows:Remove air vent tube support (GTI and GTI LEmodels).Remove air intake silencer. Refer to AIR INTAKE.Turn fuel valve to OFF position.Disconnect pulse line.1F06F0LATYPICAL1. Pulse line2. Loosen gear clampDisconnect fuel supply line from fuel pump.Disconnect fuel return line.Disconnect oil injection pump cable, throttle cableand choke cable.Remove screws no. 20 and lock washers no. 21retaining carburetor.F07F03A1TYPICAL1. Remove screwsRemove carburetor.1 1110-04-2 SMR2003-032_10_04A.FM
Section 10Subsection 04FUEL SYSTEM(CARBURETOR)CLEANINGThe carburetor exterior surfaces should be cleanedwith a general solvent and dried with compressedair before disassembly.CAUTION: Be careful at carburetor cleaning notto remove paint. Paint removal will cause carburetorto rust very rapidly. Repaint if necessary.Carburetor body and jets should be cleaned witha carburetor cleaner. Follow manufacturer’s instructions. WARNINGSolvent with a low flash point such as gasoline,naphtha, benzol, etc., should not be usedas they are flammable and explosive.CAUTION: Heavy duty carburetor cleaner maybe harmful to the rubber parts, O-rings, etc.Therefore, it is recommended to remove theseparts prior to cleaning.Inspect O-rings, diaphragms and gaskets.DISASSEMBLY AND INSPECTIONInspect parts for corrosion damage (shaft, throttleplate, spring, screw, check valve housing, etc.).Needle ValveInspect needle valve tip for a grooved condition. Ifworn, needle and seat must be replaced as amatched set.Low Speed ScrewCheck tip of low speed screw no. 2 for a groovedcondition. Replace if necessary.DiaphragmPump Diaphragm Leak TestUsing a suitable pump gauge tester, perform thefollowing test proceeding as follows:– Install pump gauge tester (P/N 295 000 114) onpulse nipple.– Pump tester until it reaches 28 kPa (4 PSI).F01F0XATYPICAL1. Pump gauge tester2. Install on pulse nippleDiaphragm must stand pressure for 10 seconds.If pressure drops, replace diaphragm no. 3.Fuel Pump ValveCheck fuel pump valve operation as follows:Connect a clean plastic tubing to the inlet nipple of thefuel pump body no. 4 and alternately apply pressureand vacuum with the mouth. The inlet valve shouldrelease with pressure and hold under vacuum. WARNINGSome fuel may be present in fuel pump. Becareful not to swallow fuel when under vacuum.F01F0WATYPICAL1. Fuel outlet nipple2. Pulse nipple3. Inlet nipple2Repeat the same procedure at the outlet nipple ofthe fuel pump body no. 4. This time the outletvalve should hold with pressure and release undervacuum.Inspect valves. The pumping area should be freeof holes, tears or imperfections. Replace as needed.1312SMR2003-032_10_04A.FM 10-04-3
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