134
FAULT TESTING
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
CARBURETOR
OVERFLOW/LEAK
Worn inlet valve or dirty valve seat Replace valve or clean valve seat
Worn float mounting tang Replace float
Worn float pin Replace pin
Damaged float bowl gasket Replace gasket
Damaged float Replace float
POOR LOW SPEED
PERFORMANCE
Clogged pilot port Clean pilot port
Clogged low speed jet Clean low speed jet
Loose low speed jet Tighten jet
POOR FUEL ECONOMY
Loose jets Tighten jets
Choke not opening fully Adjust choke
Dirty air cleaner Clean/replace air filter
Poor fuel quality Replace with fresh fuel
POOR ACCELERATION
Clogged fuel passages Clean fuel passages
Clogged low speed jet or bleed tube Clean
Fuel level too low Adjust float
Dirty air cleaner Clean/replace air filter
HARD STARTING
Choke plate not operating properly Adjust choke system
Dirty carburetor Clean carburetor
Loose carburetor Tighten carburetor
Fuel overflow Inspect float and valve. Repair or replace
Faulty fuel pump Replace fuel pump
Poor fuel quality Replace with fresh fuel
POOR HIGH SPEED OPERATION
Fuel pump faulty Replace fuel pump
Loose main jet Tighten main jet
Incorrect fuel level in float bowl Adjust float
Dirt in fuel tank or hoses Clean
Clogged fuel filter Replace fuel filter
Clogged main jet or main jet air passage Clean jet
Dirty air filter Clean/replace filter element
ABNORMAL COMBUSTION
(FUEL MIXTURE)
Dirty carburetor Clean carburetor
Dirt in fuel tank, hoses or filter Clean or replace
Clogged air or fuel filter Replace
Poor fuel quality Replace with fresh fuel
Condition Possible Cause Correction
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