Yamaha YZ426F, Owner'S Service Manual

Page: 314 / 633

4 - 38
ENG
VALVES AND VALVE SPRINGS
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.
NOTE:
When you purchase a cylinder head, you can-
not designate its size. Choose the valve lifter
that matches the above chart.
Combination
Cylinder head mark
a
(color)
Valve lifter mark
b
(color)
Blue Blue
Yellow Yellow
Purple Black
a
b
ASSEMBLY AND INSTALLATION
1. Apply:
●
Molybdenum disulfide oil
Onto the valve stem and valve stem
seal.
2. Install:
●
Valves 1
●
Valve spring seats 2
●
Valve stem seals 3
●
Valve springs 4
●
Valve spring retainers 5
NOTE:
●
Make sure that each valve is installed in its
original place, also referring to the painted
color as follows.
Intake (middle)
a
: light blue
Intake (right/left)
b
: white
Exhaust: not paint
●
Install the valve springs with the larger pitch
c
facing upward.
d
Smaller pitch
New