FAULT TESTING
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
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POOR LOW SPEED
PERFORMANCE
Plugged gas tank vent Clean or repair
Choke on Push choke in
Carburetor float level incorrect Check/replace float
Clutches not shifting out Replace clutch/clutches
Fuel pump faulty Repair or replace
Insufficient fuel level Add fuel
Air leak at carburetor gasket Repair component
Spark plug fouled Clean or replace
Weak spark Check magneto
Incorrect valve lash Check and adjust
Belt slipping Check belt and clutch surfaces
Replace belt or clean clutches
Faulty accelerator adjustment Check and adjust
Faulty governor adjustment Check and adjust
POOR MIDRANGE OR HIGH SPEED
PERFORMANCE
Spark plug fouled Clean or replace
Weak spark Check magneto
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 not adjusted properly Adjust
Faulty accelerator adjustment Check and adjust
Faulty governor adjustment Check and 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
Heavy loads Lighten load
Incorrect fuel Use correct seasonal blend fuel. Do not
use old fuel
Condition Possible Cause Correction
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