Yamaha TTR90 Fahrer- Und Wartungshandbuch Seite 234

VALVES AND VALVE SPRINGS
ASSEMBLY AND INSTALLATION
1. Apply:
2. Install:
NOTE:
• Make sure that each valve is installed in its
original place, also referring to the embossed
mark as follows.
• Install the valve springs with the larger pitch
a facing upwards.
b Smaller pitch
3. Install:
NOTE:
While compressing the valve spring with a
valve spring compressor and attachment 1
install the valve cotters.
4. To secure the valve cotters onto the valve
CAUTION:
Hitting the valve tip with excessive force
could damage the valve.
4 - 20
• Molybdenum disulfide oil
(onto the valve stem and valve stem seal)
• Valve stem seats
• Valves
• Valve springs
• Valve spring retainers
Intake: "G"
Exhaust: "L"
• Valve cotters
Valve spring compressor:
YM-4019/90890-04019
stem, lightly tap the valve tip with a piece of
wood.
ENG
New