Service Manual

Engine Fires Intermittently

Possible Cause Remedy

Fouled, improperly gapped, or broken spark plug Clean or replace spark plug; set gap to

0.018-0.023 in. (0.45 to 0.58 mm)

Incorrect air gap between flywheel and ignition module Set ignition module air gap to

0.010-0.015 inch (0.254-0.381 mm)

Faulty ignition module Replace ignition module

Incorrect fuel mixture Drain tank; refill with correct fuel mixture

Engine Does Not Produce Maximum Power

Possible Cause Remedy

Plugged air filter Clean or replace filter

Incorrect fuel mixture Drain tank; refill with correct fuel mixture

Plugged muffler Clean or replace muffler

Plugged or waterlogged fuel filter Replace fuel filter

Improperly adjusted carburetor Adjust carburetor

Air leak at carburetor base gasket Tighten carburetor fasteners or replace

carburetor base gasket

Intermittent spark Replace ignition module

Low compression Replace piston ring or cylinder

Leaking crankcase seals Replace crankcase seals

Scored piston and/or cylinder Replace piston cylinder assembly

Worn piston rings or low compression Overhaul engine

Carburetor Floods

Possible Cause Remedy

Faulty primer or improperly installed primer/fuel lines Correctly install primer/fuel lines or

replace primer

Improperly adjusted carburetor Adjust carburetor

Damaged carburetor Replace carburetor

Leaking fuel inlet needle Replace fuel inlet needle

TROUBLESHOOTING

2 - 5