Troubleshooting Guide
ENGINE DOES NOT START OR HARD TO START
What To Check
Does the engine crank?
YES
Good compression?
YES
Does the tank contain fresh fuel of the proper grade?
YES
Possible Cause
Faulty recoil starter.
NO 
Fluid in the crankcase.
Internal damage.
| NO |
| Loose spark plug. |
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| Excess wear on cylinder, piston, rings. | |
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| Valves not seating. |
Fuel incorrect, stale or contaminated;
NO 
mixture incorrect.
Remedy
Consult with an authorized servicing dealer.
Tighten and
Consult with an authorized servicing dealer.
Refill with fresh, clean unleaded gasoline with a pump octane of 87 or higher mixed with
a
Is fuel visible and moving in the return line when priming?
| NO |
| Check for clogged fuel filter and/or vent. |
| Replace fuel filter or vent as required; restart. |
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| Priming pump not functioning properly. |
| Consult with an authorized servicing dealer. |
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YES
Is there spark at the spark plug wire terminal?
YES
Check the spark plug.
The ignition switch is in “O” (OFF) NO 
position.
Shorted ignition ground. Faulty ignition unit.
If the plug is wet, excess fuel may be in 
the cylinder.
The plug is fouled or improperly gapped.
The plug is damaged internally or of the wrong size.
Move switch to “I” (ON) position and restart.
Consult with an authorized servicing dealer.
Crank the engine with the plug removed, reinstall the plug, and restart.
Clean and regap the plug to 0.04 - 0.08 inch (0.6 - 0.7 mm). Restart.
Replace the plug with an NGK CMR5H or equivalent resistor type spark plug of the correct heat range. Set spark plug electrode gap to
15