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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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