Troubleshooting Guide

ENGINE DOES NOT START

What To Check

Does the engine crank?

YES

Good compression?

YES

Does the tank contain fresh fuel of the proper grade?

YES

Is fuel visible and moving in the return line when priming?

YES

Is there spark at the spark plug wire terminal?

YES

Check the spark plug.

NO

NO

NO

NO

NO

Possible Cause

Faulty recoil starter.

Fluid in the crankcase.

Internal damage.

Loose spark plug.

Excess wear on cylinder, piston, rings. Valves not seating.

Fuel incorrect, stale, or contaminated; mixture incorrect.

Check for clogged fuel filter and/or vent. Priming pump not functioning properly.

The ignition switch is in “O” (OFF) 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.

Remedy

Consult with an authorized servicing dealer.

Tighten and re-test.

Consult with an authorized servicing dealer.

Refill with fresh, clean unleaded gasoline with a pump octane of 87 or higher mixed with a 2-cycle air cooled mixing oil that meets or exceeds ISO-L-EGD and/or JASO FC classified oils at 50:1 gasoline/oil ratio.

Replace fuel filter or vent as required; restart.

Consult with an authorized servicing dealer.

Move switch to “I” (ON) position and re-start.

Consult with an authorized servicing dealer.

Crank the engine with the plug removed, reinstall the plug, and restart.

Clean and regap the plug to 0.024 - 0.028 inch (0.6 - 0.7 mm). Restart.

Replace the plug with an NGK CMR5H or equivalent resistor type spark plug of the correct range. Set spark plug electrode gap to 0.024 - 0.028 inch (0.6-0.7 mm).

 

 

 

 

 

 

 

 

 

 

 

LOW POWER OUTPUT

 

 

What To Check

 

 

 

Possible Cause

 

Remedy

 

 

 

 

Operator is overworking the unit.

 

Cut at a slower rate.

Is the engine overheating?

 

 

 

 

 

 

 

Carburetor mixture is too lean.

 

Consult with an authorized servicing dealer.

 

 

 

 

 

 

 

 

 

 

 

 

 

Improper fuel ratio.

 

Refill with fresh, clean unleaded gasoline with a pump

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

octane of 87 or higher mixed with a 2-cycle air cooled

 

 

 

 

 

 

mixing oil that meets or exceeds ISO-L-EGD and/or

 

 

 

 

 

 

JASO FC classified oils at 50:1 gasoline/oil ratio.

 

 

 

 

 

 

 

 

 

 

Fan, fan cover, cylinder fins dirty or damaged.

 

Clean, repair or replace as necessary.

 

 

 

 

 

 

 

 

 

Carbon deposits on the piston or in the muffler.

 

Consult with an authorized servicing dealer.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Clogged air cleaner element.

 

Service the air cleaner element.

Engine is rough at all speeds.

 

 

 

 

 

 

 

 

May also have black smoke and/

 

 

 

Loose or damaged spark plug.

 

Tighten or replace.

 

 

 

 

 

or unburned fuel at the exhaust.

 

 

 

Air leakage or clogged fuel line.

 

Repair or replace fuel filter and/or fuel line.

 

 

 

 

 

 

 

 

 

 

Water in the fuel.

 

Replace the fuel. See page 8.

 

 

 

 

 

 

 

 

 

Piston seizure.

 

 

 

 

 

 

 

 

 

 

 

 

Faulty carburetor and/or diaphragm.

 

Consult with an authorized servicing dealer.

 

 

 

 

Valve clearance set incorrectly.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Overheating condition.

 

See above.

Engine is knocking.

 

 

 

 

 

 

 

Improper fuel.

 

Check fuel octane rating; check for presence of

 

 

 

 

 

 

 

 

 

 

 

 

 

Carbon deposits in the combustion chamber.

 

alcohol in the fuel (page 8). Refuel as necessary.

 

 

 

 

 

 

 

 

 

 

Consult with an authorized servicing dealer.

 

 

 

 

 

 

 

 

 

Valve clearance set incorrectly.

 

 

 

 

 

 

 

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Shindaiwa 62640-94313 manual Troubleshooting Guide, What To Check Possible Cause Remedy
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