Specifications

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CHAPTER 9. TROUBLESHOOTING
TROUBLESHOOTING
Below is a list of common problems and remedies. Follow a uniform procedure to locate and eliminate
the causes.
Cause Remedy
A. ENGINE FAILS TO START OR STARTS WITH DIFFICULTY
No fuel in tank. Fill tank with clean, fresh fuel.
Shut-off valve closed. Open valve
Obstructed fuel line. Clean fuel screen and line. If necessary, remove
and clean carburetor.
Tank cap vent obstructed. Open vent in fuel tank cap.
Water in fuel. Drain tank. Clean carburetor and fuel lines. Dry
spark plug electrodes. Fill tank with clean, fresh
fuel.
Engine over-choked. Close fuel shut-off and pull starter until engine
starts. Reopen fuel shut-off for normal fuel flow.
Improper carburetor adjustment. Adjust carburetor.
Loose or defective magneto wiring. Check magneto wiring for shorts or grounds;
repair if necessary.
Faulty ignition unit. Check ignition unit. Solid State.
Check points, timing on standard ignition units.
Spark plug fouled. Clean and regap spark plug.
Spark plug porcelain cracked. Replace spark plug.
Poor compression. Check compression.
No spark at plug. Disconnect ignition cut-off wire at the engine. Crank
engine. If spark at spark plug, ignition switch, safety
switch or interlock switch is inoperative. If no spark,
check magneto. Check wires for poor connections,
cuts, or breaks.
Electric starter does not crank engine. See 12 volt starter trouble shooting chart page.
B. ENGINE KNOCKS
Carbon in combustion chamber. Remove cylinder head and clean carbon from
head and piston.
Loose or worn connecting rod. Replace connecting rod.
Loose flywheel. Check flywheel key and keyway; replace parts if
necessary. Tighten flywheel nut to proper torque
(See Table of Specifications).
Worn cylinder. Recondition cylinder or replace.
Improper Magneto Timing. Time ignition.
Improperly set ignition unit. Check ignition unit.
Excessive main bearing end play. Readjust to correct crankshaft end play.