seats YAMAHA TTR90 2002 Owners Manual

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ENGVALVES AND VALVE SPRINGS
ASSEMBLY AND INSTALLATION
1. Apply:
lMolybdenum disulfide oil
(onto the valve stem and valve stem
seal)
2. Install:
lValve stem seats
lValves
lValve springs
lValve spring retainers
NOTE:
lMake sure that each valve is installed in its
original place, also referring to the embossed
mark as follows.
Intake: “G”
Exhaust: “L”
lInstall the valve springs with the larger pitch
a facing upwards.
bSmaller pitch
New
3. Install:
lValve cotters
NOTE:
While compressing the valve spring with a
valve spring compressor and attachment 1
install the valve cotters.
Valve spring compressor:
YM-4019/90890-04019
4. To secure the valve cotters onto the
valve stem, lightly tap the valve tip with a
piece of wood.
CAUTION:
Hitting the valve tip with excessive force
could damage the valve.