Yamaha YZ426F(M)/LC Owner's Service Manual page 300

VALVES AND VALVE SPRINGS
Valve lifter
1. Inspect:
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 1 and attachment 2
install the valve cotters.
4 - 33
Valve lifter
Scratches/damage → Replace both lift-
ers and cylinder head.
Molybdenum disulfide oil
Onto the valve stem and valve stem
seal.
Valves 1
Valve spring seats 2
Valve stem seals 3
Valve springs 4
Valve spring retainers 5
Intake (right/left): "5BE"
Intake (middle): "5BE"
Exhaust: "5BE"
Valve cotters
Valve spring compressor:
YM-04019/90890-04019
Attachment:
YM-04108/90890-04108
ENG
New