Electric Starting System; Engine Starts But Stalls - Yamaha EH63 Service Manual

ELECTRIC STARTING SYSTEM

ELECTRIC STARTING SYSTEM
1
No.
2
1 Check the battery (option).
Check the starter motor operation.
3
2 (Refer to "CHECKING THE STARTER MOTOR OPERA-
TION" on page 5-8.)
4
3 Check the engine switch (equipped models only).
Check the starting system wiring.
4
5
(Refer to "CIRCUIT DIAGRAM" on page 5-1.)
5 The starting system circuit is OK.
6

ENGINE STARTS BUT STALLS

7
No.
8
1 Check the fuel level.
2 Check if the fuel hoses are clogged.
9
Check if there is air suction from the carburetor joint, gas-
3
ket, or throttle shaft.
10
Check the compression pressure.
4 (Refer to "MEASURING THE COMPRESSION PRES-
SURE" on page 3-1.)
Measure the valve clearance.
5 (Refer to "ADJUSTING THE VALVE CLEARANCE" on
page 2-12.)
Check if there is seizure, wear, or damage on the piston,
piston ring, or cylinder.
6
(Refer to "PISTONS, CAMSHAFT, CRANKCASE, AND
CRANKSHAFT" on page 3-44.)
7 Check the TCI unit air gap.
Checking steps
Checking steps
6-2
Possible remedy
• Clean the battery terminals.
• Recharge or replace the battery.
If the starter motor operates normally,
the starter motor is OK.
Replace the engine switch.
Properly connect or repair the starting
system's wiring.
—
Possible remedy
Add the fuel if it is insufficient.
Clean.
• Tighten the carburetor nuts securely.
• Replace the carburetor joint or gasket
with a new one.
Too high:
Decarbonize the combustion chamber if
there is carbon deposits.
Too low:
Next checking steps.
Adjust the valve clearance.
Rebore or replace.
Adjust.