Valve Installation - Yamaha F100A Service Manual

POWR
A
VALVES
B
Valve seat cutter set:
YM-91043-C/90890-06803
Valve seat cutter holder:
YB-06553/90890-06553
Valve seat cutter:
(45˚) YB-06555/90890-06555
(90˚) YB-06556/90890-06556
Refer to the following chart to deter-
mine the appropriate valve seat cut-
ter.
Valve seat area
A
B
NOTE:
After refacing the valve seat or replacing
the valve and valve guide, lap the valve seat
and valve face.

Valve installation

1. Install:
Valve stem seal 1
Valve 2
Spring seat 3
Valve spring 4
Spring retainer 5
2. Install:
Valve cotter 6
Valve spring compressor:
YM-01253/90890-04019
Adapter:
YB-06554/90890-06554
NOTE:
Compress the valve spring with the special
tools and install the cotters onto the valve.
5-30
E
Valve seat cutter
90˚
45˚