Yamaha WR450F(R) Owner's Service Manual page 157

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VALVES AND VALVE SPRINGS
REMOVAL POINTS
1. Remove:
NOTE:
Identify each lifter 1 and pad 2 position very
carefully so that they can be reinstalled in their
original place.
2. Check:
Checking steps:
Pour a clean solvent 1 into the intake and
G
exhaust ports.
Check that the valve seals properly.
G
There should be no leakage at the valve
seat 2.
3. Remove:
NOTE:
Attach a valve spring compressor 1 between
the valve spring retainer and the cylinder head
to remove the valve cotters.
4 - 34
ENG
Valve lifters 1
G
Pads 2
G
Valve sealing
G
Leakage at the valve seat → Inspect
the valve face, valve seat and valve
seat width.
Valve cotters
G
Valve spring compressor:
YM-4019/90890-04019

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