Yamaha YZ250F(W) Owner's Service Manual page 342

VALVES AND VALVE SPRINGS
ASSEMBLY AND INSTALLATION
Valve and valve spring
1. Apply:
2. Install:
NOTE:
• Make sure that each valve is installed in its
original place, also referring to the painted
color as follows.
• Install the valve springs with the larger pitch
c facing upward.
d
3. Install:
NOTE:
While compressing the valve spring with a
valve spring compressor 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 - 41
• Molybdenum disulfide oil
Onto the valve stem and valve stem seal.
• Valve 1
• Valve spring seat 2
• Valve stem seal 3
• Valve spring 4
• Valve spring retainer 5
To cylinder head.
Intake (middle) a: orange
Intake (right/left) b: green
Exhaust: no paint
Smaller pitch
• Valve cotter
Valve spring compressor:
YM-4019/90890-04019
stem, lightly tap the valve tip with a piece of
wood.
ENG