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- Remove four screws (32) from purge pump side of carburetor.
- Remove purge pump (33), metering chamber (12) and fuel pump
gaskets / diaphragms (44).
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- Inspect all gaskets and diaphragms for brittleness, wrinkles and
tears. Replace as required.
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- Remove and replace the fuel inlet screen (5).
Use a rod of 2mm (0.1 in) diameter for removing and 7.6mm (0.3 inch)
diameter for installing.
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- Remove main jet (18) from carburetor body with a small
screw driver as illustrated.
Inspect jet orifice for blockages or damage.
Clean with compressed air or replace if necessary.
Replace O-ring (35) if damaged.
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- Inspect the inlet valve assembly for damaged
components or dirt on the Needle Seats.
Note: This valve must hold a minimum of 0.5 kg/cm2 (7 PSI) when in
closed position.
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- To remove the lever (9), axle (34) spring (8) and
needle (7), simply pry the axle (34) from the metering chamber body.
Use care not to damage any components.
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- Clean all components and adjust lever height to 1.5mm
(0.06 inch) below gasket surface of the metering chamber body as
shown.
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- Disconnect fuel return line from carburetor.
- Connect pressure tester (31) to return fitting on carburetor.
- Pump purge pump bulb (15) several times until the pressure
tester shows 0.5 kg/cm2 (7 PSI).
- If the tester does not hold CONTACT at this range, remove and
inspect the purge pump.
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- Clean the purge pump (33) with a minimum of 2 kg/cm2
(28 PSI) compressed air.
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- Pay particular attention to clean the brass check
valves but be careful not to damage them.
Recheck the pump operation after reassembly. If problems
persist, replace the pump body.
Note: Do not attempt to remove the check valves (21, 22) as they
will be damaged.
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- Reassemble the carburetor in reverse order of
disassembly.
Pay special attention to cleanliness during reassembly.
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- Check gaskets and diaphragms for correct installation
by referring to the location in order of their corresponding tabs
(30).
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- After reassembly, pressure test the fuel pump and
inlet valve to insure proper seal. It must hold a minimum of
0.5 kg/cm2 (7 PSI).
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