Yamaha F25 [170/444] Camshaft and valves

Yamaha F25 [170/444] Camshaft and valves
5-27
POWR
E
CAMSHAFT AND VALVES
Valve guide replacement
Replacement steps:
Remove the valve guide with the valve
guide remover.
Valve guide remover and
installer:
90890-06801
Install the circlip and the new valve
guide with the valve guide installer
and valve guide remover.
Valve guide installer attachment:
YM-4015/90890-06802
After installing the valve guide, bore
the valve guide with the valve guide
reamer to obtain the proper valve-
stem-to-valve-guide clearance.
Valve guide reamer:
90890-06804
NOTE:
Heat the cylinder in an oven to 200 ˚C
(392 ˚F) to ease valve guide removal and
installation, and to maintain the correct
interference fit.
Valve installation
1. Install:
Valve cotters
Valve spring compressor:
YM-01253/90890-04019

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