4-26
ENG
CYLINDER HEAD, CYLINDER AND PISTON
EC474841
Power valve
1. Inspect:
9
Power valve 1, 2
1
Wear/Damage
→
Replace.
Carbon deposits
→
Remove.
9
Valve holder 1
2
9
Link lever
3
9
Pulley
4
9
Valve shaft
5
9
Link rod
6
9
Plain washer
7
Wear/Damage
→
Replace.
9
Spring 1, 2
8
Broken
→
Replace.
EC474901
Power valve hole on cylinder
1. Remove:
9
Carbon deposits
From power valve hole surface
a
.
NOTE:
Do not use a sharp instrument. Avoid scratching
the aluminum.
3. Combination:
Combine the piston and cylinder by the fol-
lowing chart.
NOTE:
When you purchase a cylinder, you cannot des-
ignate its size. Choose the piston that matches
the above chart.
Cylinder mark
Piston mark (color)
A
A (red)
B
B (orange)
C
C (green)
D
D (purple)
1P8-9-31-4A 5/12/05 1:19 PM Page 52
Summary of Contents for YZ250(V)
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