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
Possible Cause
Faulty recoil starter.
NO 
Fluid in the crankcase.
Internal damage.
Loose spark plug.
NO 
Excess wear on cylinder, piston, rings. Valves not seating.
Fuel incorrect, stale or contaminated; NO 
mixture incorrect.
Remedy
Consult with an authorized servicing dealer. Consult with an authorized servicing dealer. Consult with an authorized servicing dealer.
Tighten and
Consult with an authorized servicing dealer. Consult with an authorized servicing dealer.
Refill with fresh, clean unleaded gasoline with a pump octane of 87 or higher mixed with
a
ENGLISH
Is fuel visible and moving in the return line when priming?
YES
NO
Check for clogged fuel filter and/or vent.
Priming pump not functioning properly.
Replace fuel filter or vent as required; restart.
Consult with an authorized servicing dealer.
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 circuit. 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. 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 CMR6H or equivalent resistor type spark plug of the correct heat range. Set spark plug electrode gap to
What To Check
Is the engine overheating?
LOW POWER OUTPUT
Possible Cause | Remedy |
Operator is overworking the unit. | Apply less presure on the sweeper drums. |
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 |
| mixing oil that meets or exceeds |
| JASO FC classified oils at 50:1 gasoline/oil ratio. |
Engine is rough at all speeds. May also have black smoke and/or unburned fuel at the exhaust.
Engine is knocking.
Fan, fan cover, cylinder fins dirty or damaged.
Carbon deposits on the piston or in the muffler.
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.
Clean, repair or replace as necessary.
Consult with an authorized servicing dealer.
Service the air cleaner element.
Tighten or replace.
Repair or replace filter and/or fuel line.
Replace the fuel. See page 10.
Consult with an authorized servicing dealer.
Consult with an authorized servicing dealer.
Consult with an authorized servicing dealer.
See above.
Check fuel octane rating; check for presence of alcohol in the fuel (pg. 10). Refuel as necessary.
Consult with an authorized servicing dealer.
Consult with an authorized servicing dealer.
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