Yamaha WR250F Manuel D'atelier page 346

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VALVES AND VALVE SPRINGS
a
b
Combination of cylinder head and valve lifter
1. Combination:
For this combination, match the paint color
on the cylinder head with that on the valve
lifter according to the chart below.
Combination
Cylinder head mark
a (color)
Red
Blue
Yellow
Purple
NOTE:
When you purchase a cylinder head, you can-
not designate its size. Choose the valve lifter
that matches the above chart.
ASSEMBLY AND INSTALLATION
Valve and valve spring
1. Apply:
Molybdenum disulfide oil
Onto the valve stem and valve stem
seal.
2. Install:
Valve 1
Valve spring seat 2
Valve stem seal 3
Valve spring 4
Valve spring retainer 5
To cylinder head.
NOTE:
Make sure that each valve is installed in its
original place, also referring to the painted
color as follows.
Intake (middle) a: yellow
Intake (right/left) b: white
Exhaust: no paint
Install the valve springs with the larger pitch
c facing upward.
d Smaller pitch
4 - 40
ENG
Valve lifter mark b
(color)
Red
Blue
Yellow
Black