Possible Cause Corrective Action
Defective spark plug. Adjust the spark plug gap, replace the
spark plug as needed.
Clogged air cleaner. Inspect and clean or replace the air filter
as needed.
The engine runs rough.
Possible Cause Corrective Action
Clogged air cleaner. Inspect and clean or replace the air filter
as needed.
A plugged fuel filter. Inspect the fuel filter, replace the fuel
filter as needed.
A blockage in the fuel supply hose. Inspect the fuel hoses, clean or replace
the fuel hoses as needed.
Stale, dirty or wrong seasonal fuel
mixture.
Drain the fuel system, and replenish with
fresh fuel. Inspect and clean the
carburetor as needed.
The fuel level is low. Fill the fuel tank.
Defective spark plug. Adjust the spark plug gap, replace the
spark plug as needed.
Incorrect choke setting. Adjust the choke setting as needed.
A faulty fuel pump. Inspect the fuel pump, replace the pump
as needed.
Dirty or faulty carburetor. Clean and repair/replace the carburetor
as required.
Improper valve clearance. Check and adjust valve clearance.
The engine is low on power.
Possible Cause Corrective Action
Clogged air cleaner. Inspect and clean or replace the air filter
as needed.
A plugged fuel filter. Inspect the fuel filter replace the fuel
filter as needed.
A blockage in the fuel supply hose. Inspect the fuel hoses, clean or replace
the fuel hoses as needed.
Engine oil level is too low or high. Adjust the engine oil level as needed.
Poor engine compression. Complete engine compression test.
4520P Page 3–9 Troubleshooting: General Engine Problems
09.40003Rev 00
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