Section 6
Continued
Periodic Maintenance and Adjustment
Trouble Shooting Engine
SYMPTOM
PROBABLE
CAUSE
1. Engine will not start.
No fuel in tank or shut-off valve closed.
Spark plug not fi ring.
Fuel not being delivered to combustion chamber.
Engine fl ooded. Too much fuel in combustion
chamber.
Improper spark plug gap.
Plugged fuel fi lter.
2. Engine hard to start.
Water or dirt in fuel or stale fuel mixture.
Weak ignition spark.
Plugged air fi lter.
Engine over or under choked.
Gasket or seal leaks.
Spark plug fouled.
3. Engine starts but will
Insuffi cient fuel supply.
not continue to run.
Fuel line clogged.
Vent on fi ller 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)
ROKON INTERNATIONAL, 50 Railroad Ave., Rochester, New Hampshire 03839, U.S.A
.
Copyright 2002-7
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