G424 Service Manual Adjustment and Troubleshooting191
Needle valve and valve seat not seating –Clean or replace
properly
Incorrect float level –Adjust
Worn float lip –Replace
Worn float level pin and related components –Replace level pin and its related parts
Malfunction choke valve –Repair
Idle rpm set out of adjustment –Adjust idling speed
Damaged idle adjust screw –Replace adjust screw
Clogged idle passage or idle port –Clean
Clogged bypass screw –Clean jet
Worn throttle shaft –Replace shaft
Loose vacuum pipe union –Retighten union
Idling circuit not airtight –Clean
Incorrect float level –Replace
Too lean mixture –Clean or replace
Inner dirty carburetor –Clean carburetor
Defective float level –Adjust float
Defective accelerating pump plunger –Disassemble or replace
Clogged pump jet –Clean or replace
Defective accelerating linkage –Replace linkage
Malfunction power piston –Replace power piston
Malfunction power valve –Replace
Clogged power jet –Clean or replace
Float level too low –Adjust float
Throttle valve not opening completely –Adjust valve
Clogged main jet –Clean
Incorrect float level –Adjust float
Malfunction power piston –Replace power piston
Malfunction power valve –Replace power valve
Worn throttle shaft –Replace shaft
Throttle valve not opening completely –Adjust valve
Choke valve stuck close –Repair or replace
Float level too high –Adjust float
Defective power valve –Replace valve
Choke valve not opening completely –Check linkage, replace
Improper idling speed –Adjust idling speed
Poor engine
startability
Poor idle
Abnormal
combustion
Poor acceleration
Insufficient output
Excessive fuel
consumption
Carburetor
Carburetor
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