Yamaha F4B - Adjusting the CDI Unit Air Gap; Checking the Valve Clearance

7-2
Power unit (check and adjustment)
0
1
2
3
4
5
6
7
8
9
10
A
1. Remove the manual starter. See
“Removing the manual starter” (7-7).
2. Turn the flywheel magnet clockwise to
align the permanent magnet a with the
protrusions b on the CDI unit.
3. Measure the CDI unit air gap c.
Adjusting the CDI unit air gap
Do not turn the flywheel magnet counter-
clockwise. Otherwise, the water pump
impeller could be damaged.
1. Turn the flywheel magnet clockwise to
align the permanent magnet a with the
protrusions b on the CDI unit.
2. Loosen the CDI unit bolts a, and then
adjust the CDI unit air gap c.
3. Tighten the CDI unit bolts a to the
specified torque.
4. Measure the CDI unit air gap.
Checking the valve clearance
Measure the valve clearances when the
engine is cold.
Do not turn the flywheel magnet counter-
clockwise. Otherwise, the water pump
impeller could be damaged.
1. Remove the clip from the engine shut-off
switch.
2. Remove the engine shut-off switch lead
a, ground leads a and b from the
holders c and d.
3. Loosen the bolts e in the order a, b,
and so on, and then remove the cylinder
head cover f and gasket g.
CDI unit air gap c:
0.4–0.6 mm (0.016–0.024 in)
CDI unit air gap c:
0.4–0.6 mm (0.016–0.024 in)
c
b
a
c
b
a
a
CDI unit bolt a:
10 N·m (1.0 kgf·m, 7.4 ft·lb)
a
a
b
d
c
a