Trouble Shooting Engine
SYMPTOM PROBABLE CAUSE
1. Engine will not start. No fuel in tank or shut-off valve closed.
Spark plug not firing.
Fuel not being delivered to combustion chamber.
Engine flooded. Too much fuel in combustion
chamber.
Improper spark plug gap.
Plugged fuel filter.
2. Engine hard to start. Water or dirt in fuel or stale fuel mixture.
Weak ignition spark.
Plugged air filter.
Engine over or under choked.
Gasket or seal leaks.
Spark plug fouled.
3. Engine starts but will Insufficient fuel supply.
not continue to run. Fuel line clogged.
Vent on filler cap plugged.
Dirty carburetor.
Air leak in fuel system.
Defective or fouled spark plug.
Idle screw not adjusted properly.
4. Engine misses. Dirt in fuel system.
Spark plug fouled or defective.
Faulty magneto or improper ignition coil air gap
setting.
Idle screw not adjusted properly.
5. Engine lacks power. Air cleaner clogged.
Incorrect spark plug – gap too wide or too narrow.
Incorrect air gap on ignition coil.
Worn or stuck piston rings or leaky head gasket.
Ice in system.
Hi altitude running. (use hi altitude jet)
Section 6 Continued Periodic Maintenance and Adjustment
14
ROKON INTERNATIONAL, 50 Railroad Ave., Rochester, New Hampshire 03839, U.S.A. Copyright 2004
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