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
Summary of Contents for EXPRESS L4
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