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2 CYCLE ENGINE TROUBLESHOOTING CHART (Cont.)
Cause Remedy
ENGINE MISSES UNDER LOAD
Spark plug fouled Clean and regap spark plug.
Spark plug porcelain cracked Replace spark plug.
Improper spark plug gap Regap spark plug.
Pitted magneto breaker points Clean and dress breaker points. Replace badly
pitted breaker points.
Magneto breaker arm sluggish Clean and lubricate breaker point arm.
Faulty condenser Check condenser on a tester; replace if defective
(see test instrument instructions and specifications).
Improper carburetor adjustment Adjust carburetor.
Reed fouled or sluggish Clean or replace reed.
Crankcase seal leak Replace worn crankcase seals.
ENGINE LACKS POWER
Choke partially closed Open choke.
Blown head gasket Replace head gasket.
Improper carburetor adjustment Adjust carburetor.
Improper or partially sheared flywheel key or Replace with new correct key or sleeve.
adapter sleeve.
Magneto improperly timed Time magneto.
Worn piston or rings Replace piston or rings.
Air cleaner clogged Clean air cleaner.
Reed fouled or sluggish Clean or replace reed.
Improper amount of oil in fuel mixture Drain tank; fill with correct mixture (See engine
decal).
Carburetor improperly adjusted Adjust carburetor.
Crankcase seals leaking Replace worn crankcase seals
ENGINE OVERHEATS
Engine improperly timed Time engine.
Improper or partially sheared flywheel key or Replace with new correct key or sleeve.
adapter sleeve.
Air flow obstructed Remove any obstructions from air passages in
shrouds.
Cooling fins clogged Clean cooling fins.
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