Yamaha TT-R90 Manuel D'atelier Du Proprietaire page 224

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