Electrical Circuit - Suzuki FZ50 1979 Service Manual

4-2 SER .VICI G
HARD ENGINE STARTING OR NO ENG I NE STARTING
ENGINE
1.
Compression leakage fro m c ra n k chamber
•
Lea kage from cran kcase mating su rface
•
Leakage due to defective crankshaft oi I seal
•
Leakage from cylinder base gasket
•
Damaged or imp roperly tightened reed valve
2. Compression leakage from combustion chamber
•
Loose spark plug m ounting
•
Worn or sti cking piston ring
•
Defective o r warped cyl i nder h ead mat i ng su rface
•
Loose cyli nder head t i ghtening nut
•
Damaged c y l i nder h ead gasket
•
Piston seizu re, wear or ho led p i ston
FUEL CIRCUIT
1. F uel l i ne
•
Clogged fuel cock strainer
•
Damaged fuel cock diaph ram
•
Clogged fuel hose
2. Air passage
•
Cl ogged ta n k cap b reather hole
•
Air i ntake due to defective fu el cock vacu u m h ose
•
A i r i ntake due to damaged reed valve gasket
•
Air i ntake d ue to loose carbu retor i n let mou nti ng
3.
Carburetor
•
Clogged need l e valve
•
Clogged a i r j et or p i l ot jet
•
Poor return of choke plu nger

ELECTRICAL CIRCUIT

1. N o sparking at spa rk plug
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B ridged, carbon fo u led o r wet spark p l ug
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B roken or s h o rt ci rcu ited i gniti o n coil
•
B roken or i m p roperly connected eng i ne ground wi re
•
Defective engine k i l l switch
•
Defective PE I unit
•
Poor contact of i gnition switch
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Defective wi ring a m ong stator, P E I u ni t and ignition coi l
•
Poor contact between spa rk plug cap a nd h i g h tension cord
2. Sparki ng at spark plug
•
I mproperly t i med ignition
•
Loose mou nting part of stator o r rotor
•
Check engi ne unit or fuel circuit
TRO U BLES HOOTI NG