Yamaha MZ360, Service Manual

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ELECTRIC STARTING SYSTEM (Equipped models)
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TR
OUBLESHOO
TING
ELECTRIC STARTING SYSTEM (Equipped models)
The starter motor fails to turn.
ENGINE STARTS BUT STALLS
No. Checking steps Possible remedy
1
Check the fuse.
(Refer to “CHECKING THE FUSE (Equipped models)” on
page 5-8)
Replace the fuse.
2 Check the battery (option).
• Clean the battery terminals.
• Recharge or replace the battery.
3
Check the starter motor operation.
(Refer to “CHECKING THE STARTER MOTOR OPERA-
TION (Equipped models)” on page 5-14)
If the starter motor operates normally,
the starter motor is OK.
4
Check the starter motor.
(Refer to “ELECTRIC STARTING SYSTEM” on page 5-15)
Repair or replace the starter motor.
5 Check the engine switch. Replace the engine switch.
6
Check the entire starting system’s wiring.
(Refer to “CIRCUIT DIAGRAM” on page 5-1) Properly connect or repair the starting
system’s wiring.
7 The starting system circuit is OK. —
No. Checking steps Possible remedy
1 Check the fuel level. Add the fuel if it is insufficient.
2 Check if the fuel cock is clogged. Clean.
3 Check if the fuel hoses is clogged. Clean.
4
Check if there is air suction from the carburetor joint, gas-
ket, or throttle shaft.
• Tighten the carburetor nuts securely.
• Replace the carburetor joint or gasket
with a new one.
5
Check the compression pressure.
(Refer to “MEASURING THE COMPRESSION PRES-
SURE” on page 3-1)
Too high:

Decarbonize the combustion chamber if
there is carbon deposits.
Too low:

Next checking steps.
6
Check the valve clearance.
(Refer to “ADJUSTING THE VALVE CLEARANCE” on
page 2-12)
Adjust the valve clearance.
7
Check if there is seizure, wear, or damage on the piston,
piston ring, or cylinder.
(Refer to “PISTON, CAMSHAFT, CRANKCASE, AND
CRANKSHAFT” on page 3-44)
Rebore or replace.
8 Check the TCI unit air gap. Adjust.