Valve Clearance - Yamaha F4 Service Manual

INSP
ADJ
a
b
POWER UNIT
1
2
4
3
5
7
6
7
6

Valve clearance

NOTE:
Adjust valve clearance, at room tempera-
ture, when piston is near T.D.C. in com-
pression process.
1. Remove:
9 Top cowling
9 Bolt (carrying handle)
9 Carrying handle 2 (protector)
9 Bottom cowling 2
9 Bolt (recoil starter)
9 Recoil starter ass'y
Spark plug
9
2. Remove:
Bolt (cylinder head cover) 1
9
Cylinder head cover 2
9
9 Gasket (cylinder head cover)
3. Position:
Flywheel rotor
9
NOTE:
Turn the flywheel rotor ass'y clockwise and
check that the valves are fully closed with
there rocker arm in free position, and set
the magnet 3 on the flywheel rotor with
both core ends 4 of the ignitor ass'y 5
mated as shown.
4. Inspect:
9 Valve clearance
Use feeler gauge.
Valve clearance
Intake a a
(0.004 ± 0.0008 in)
Exhaust b b : 0.10 ± 0.02 mm
(0.004 ± 0.0008 in)
Out of specification ® Adjust.
5. Loosen:
9 lock nut (rocker arm)
NOTE:
When loosening the locknut 6, lock the ad-
juster 7, otherwise the locknut 6 will not
loose.
3-7
: 0.10 ± 0.02 mm
E