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TROUBLESHOOTING
HARD E N G I N E STARTING OR NO ENG I N E STARTING
E N G I N E
1 . Compression leakage from crank chamber
•
Leakage from cylinder base gasket
•
Damaged or improperly tightened reed valve
•
Leakage due to defective crankshaft oil seal
•
Leakage from crankcase mating surface
2. Compression leakage from combustion chamber
•
Loose spark plug mounting
•
Damaged cylinder head gasket
•
Loose cylinder head tightening nut
•
Worn or sticking piston ring
•
Piston seizure, wear or holed piston
•
Defective or warped cylinder head mating surface
FUEL CI RCUIT
1 .
Fuel line
•
Clogged fuel hose
•
Damaged fuel cock diaphram
2.
Air passage
•
Air intake due to defective fuel cock vacuum hose
•
Air intake due to damaged reed valve gasket
•
Air intake due to loose carburetor inlet mounting
•
Clogged tank cap breather hole
3.
Carburetor
•
Poor return of choke plunger
•
Clogged air jet or pilot jet
•
Clogged needle valve
ELECTRICAL CI RCUIT
1 .
No sparking at spark plug
•
Bridged, carbon fouled or wet spark plug
•
Poor contact between spark plug cap and high tension cord
•
Broken or improperly connected engine ground wire
•
Defective engine kill switch
•
Poor contact of ignition switch
•
Broken or short circuited igni tion coil
•
Defective wiring among stator, PE I unit and ignitin coil
•
Defective P E I unit
2. Sparking at spark plug
•
I mproperly timed ignition
•
Loose mounting part of stator or rotor
•
Check engine unit or fuel circuit
•
Summary of Contents for FA50
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