Yamaha 25BMH, Service Manual

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CONTROL SYSTEM
3-5
E
CHK
ADJ
(5) Set the shift lever in forward posi-
tion.
(6) Fully open the throttle by moving
the throttle to the “FAST” position.
(7) Check the ignition timing by pointing
the timing light at the timing indicator
on the starter case.
(8) Move the throttle to full-close posi-
tion.
(9) Check the ignition timing by pointing
the timing light at the timing indicater
on the starter case.
NOTE:
• Ignition timing adjustment is not
required if the timing indicator reading
falls within the specification.
• If the reading is out of specification,
adjust the timing by the following pro-
cedure.
Full throttle operating range
5,350 ± 100 r/min
Ignition timing (at full advance)
25B: BTDC 22° ± 2°
30H: BTDC 25° ± 2°
Engine idle speed
1,100 ± 50 r/min
Ignition timing (at idle)
25B, 30H: ATDC 2° ± 2°
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