Page S-4
TROUBLESHOOTING
Repair and Service Manual
Read all of Section B and this section before attempting any procedure. Pay particular attention to all Notes, Cautions and Warnings.
B
POOR MIDRANGE OR HIGH SPEED
PERFORMANCE
Spark plug fouled
Clean or replace
Weak spark
Check ignition coil
Faulty ignitor
Check and adjust
Carburetor float not level
Adjust
Incorrect or plugged main jet
Check size for appropriate altitude. Clean
Dirty air filter
Clean or replace
Brake dragging
Perform brake maintenance
Low compression
Check engine
Governor misadjusted
Adjust
ENGINE OVERHEATING
Foreign matter in cylinder fins and blower
housing
Clean
Damaged blower housing or fins
Replace
Damaged or plugged muffler
Repair or replace
Inadequate oil supply
Check oil system, inspect oil pump,
change oil, fill to correct level
REPEATED SPARK PLUG
FOULING
Wrong spark plug type
Replace with correct spark plug
Wrong spark plug gap
Check and adjust if required
Faulty coil
Check and replace if required
Faulty ignitor
Check and replace if required
Poor quality gasoline
Use correct fuel, check bulk storage tank
for proper storage and handling
Air leak allowing dirt to enter system
Repair
Choke sticking closed
Repair
Wrong main jet for conditions (high altitude
operations)
Replace with correct altitude jet for
conditions
CARBURETOR FLOODS ENGINE
Inlet valve/seat dirty
Clean or replace
Fuel contamination
Clean fuel system/carburetor
Incorrect float level
Adjust
Vent hose pinched or clogged
Clear or replace
Clogged air filter element
Clean or replace
Condition
Possible Cause
Correction