ENGINE STALLING
1 .
Improper idling rpm.
2.
Fouled or worn spark plug
3.
Lean fuel/air mixture
•
Air screw out of adjustment
•
Clogged carburetor jet
•
Clogged fuel hose
•
Clogged gasoline tank cap
•
I ncorrect carburetor fuel level
4. Compression leakage from cran kcase (oil seal, mating surface)
NOT ENOUGH ENGINE POWER
1 . Defective spark plug gap
2. Clogged air cleaner
3. Clogged exhaust muffler
4. Clogged carburetor jet
5. Incorrect carburetor fuel level
6.
Slipping clutch (see clutch sli ppage)
7. Sticking piston ring
8.
Worn cy linder, piston or piston rings
POOR E N G I N E PERFO R M AN C E AT LOW-S P E E D
1. Carburetor adjustment
•
Air screw adjustment
•
Incorrect fuel level
•
Idling rpm out of adjustment
2. Ignition system
•
I ncorrect spark plug gap
SER J'ICJNC /,\'f."ORAL l 'J"JON
4-3
•
•
I mproperly timed ignition (improper stator mounting position)
3.
Air cleaner element ripped or leaking
4. Air intake through inlet hose
5. Damaged reed valve
POOR E N G I N E PE RFORMANCE AT HIGH-S P E E D
1 . Incorrect spark plug gap
2. Clogged carburetor jet
3.
Clogged air cleaner element
4.
Muffler restricted
5. I mproperly timed ignition ( i mpropr stator mounting position)
6.
Defective ignition coil
Summary of Contents for FA50
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