Checking The Ignition Timing - Yamaha F2.5A Service Manual

3. Turn the throttle stop screw 2 in direc-
tion a or b until the specified engine
idle speed is obtained.
NOTE:
• To increase the idle speed, turn the throttle
stop screw in direction a.
• To decrease the idle speed, turn the throttle
stop screw in direction b.
• When turning the throttle stop screw in
direction b, check that the throttle link con-
tacts the screw. If the throttle link does not
contact the throttle stop screw, follow steps
4–6.
4. Check that the throttle grip is in the fully
closed position.
5. Loosen the throttle cable stop screw 3,
and then adjust the engine idle speed.
3
6. After adjusting the engine idle speed,
adjust the throttle cable.
NOTE:
For adjusting procedures, see Chapter 4,
"Installing the throttle cable."
69M3E11
7. After adjusting the idle speed, rev the
engine a few times and let it idle for at
least 15 seconds to check the stability of
the engine.

Checking the ignition timing

1. Start the engine.
2. Attach the special service tool to the
spark plug wire 1.
3. Check that the flywheel magnet indent a
is visible through the timing mark b
check window. If not visible, adjust the
TCI unit air gap.
S69M3400
Power unit / Control system
Timing light: 90890-03141
a
b
1
2
3
4
5
6
7
S69M3390
8
9
3-8