Yamaha EK25BMH Service Manual page 45

CHK
CONTROL SYSTEM
ADJ
2. Adjustment with full-open throttle:
• Magnet base stopper
CAUTION:
• Make sure that engine is not running.
• Remove the plug caps.
Adjustment steps
(1) Set the shift lever
tion.
(2) Move the throttle
tion.
(3) Slowly turn the flywheel clockwise to
align the full advanced timing mark
with the specified position on the tim-
ing indicator.
Ignition timing (at full advance)
(4) Turn the magnet base
ing mark stamped on the port side
comes in line with the ignition mark
on the rotor.
(5) Check that the magnet base stopper
4
is in contact with the stopper on the
engine body (full-open end stopper)
5
3-6
1
in forward posi-
2
to full-open posi-
BTDC 22° ± 2°
3
a
E
until the tim-
b
4
5
.