Page S-6
Repair and Service Manual
B
TROUBLESHOOTING
Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
OPERATION AND APPLICATION
Engine not reaching full temperature Increase run time intervals to build higher
cylinder temperature
Continuous use at 1/4 throttle or less at low
engine speed
Instruct operator
Wide open throttle cranking Instruct operator per operator’s manual
Long and continuous down hill use Down hill use without the accelerator par-
tially depressed will flood the cylinder with
fuel due to no ignition present
Poor fuel quality Do not use old fuel. Add stabilizer for ex-
tended storage. Have fuel tested for con-
taminants.
Use of summer blend fuel in the winter Correct with fresh fuel
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
Condition Possible Cause Correction
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