Troubleshooting Guide
ENGINE DOES NOT START
What To Check |
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| Possible Cause | |
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| NO |
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| Faulty recoil starter. |
iÃÊÌ iÊi}iÊVÀ>¶ |
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| Fluid in the crankcase. | |||
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| Internal damage. |
YES |
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| Loose spark plug. |
`ÊV«ÀiÃö | NO |
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| Excess wear on cylinder, piston, rings. | |||
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| Valves not seating. |
YES |
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| Fuel incorrect, stale or contaminated; |
iÃÊÌ iÊÌ>ÊVÌ>Ê | NO |
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| mixture incorrect. | |||
vÀià ÊvÕiÊvÊÌ iÊ«À«iÀÊ |
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}À>`i¶ |
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YES |
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| Check for clogged fuel filter and/or vent. |
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ÃÊvÕiÊÛÃLiÊ>`ÊÛ}Ê | NO |
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ÊÌ iÊÀiÌÕÀÊiÊÜ iÊ |
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| Priming pump not functioning properly. | |
«À}¶ |
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YES |
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| The ignition switch is in “O” (OFF) |
ÃÊÌ iÀiÊë>ÀÊ>ÌÊÌ iÊë>ÀÊ | NO |
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| position. | |||
«Õ}ÊÜÀiÊÌiÀ>¶ |
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| Shorted ignition ground. | ||
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YES |
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| Faulty ignition unit. |
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| If the plug is wet, excess fuel may be in | |
iVÊÌ iÊë>ÀÊ«Õ}° |
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| the cylinder. | ||
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| The plug is fouled or improperly gapped. |
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| The plug is damaged internally or of the |
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| wrong size. |
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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
Replace fuel filter or vent as required; restart.
Consult with an authorized servicing dealer.
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 0.024 - 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 heat range. Set spark plug electrode gap to
LOW POWER OUTPUT
What To Check
Is the engine overheating?
Possible Cause
Operator is overworking the unit. Carburetor mixture is too lean. Improper fuel ratio.
Fan, fan cover, cylinder fins dirty or damaged.
Carbon deposits on the piston or in the muffler.
Remedy
Cut at a slower rate.
Consult with an authorized servicing dealer.
Refill with fresh, clean unleaded gasoline with a pump octane of 87 or higher mixed with
a
Clean, repair or replace as necessary.
Consult with an authorized servicing dealer.
Engine is rough at all speeds. May also have black smoke and/or unburned fuel at the exhaust.
Engine is knocking.
Clogged air cleaner element. Loose or damaged spark plug. Air leakage or clogged fuel line. Water in the fuel.
Piston seizure.
Faulty carburetor and/or diaphragm. Valve clearance set incorrectly.
Overheating condition.
Improper fuel.
Carbon deposits in the combustion chamber.
Valve clearance set incorrectly.
Service the air cleaner element.
Tighten or replace.
Repair or replace filter and/or fuel line.
Replace the fuel. See page 7.
Consult with an authorized servicing dealer.
See above.
Check fuel octane rating; check for presence of alcohol in the fuel (pg. 7). Refuel as necessary.
Consult with an authorized servicing dealer.
Adjust valves (see page 13).
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