4-30
CYLINDER HEAD, CYLINDER AND PISTON
ENG
EC475383
Cylinder head and cylinder
1. Apply:
9
Engine oil
To piston
1
piston ring
2
and cylinder sur-
face.
2. Install:
9
Cylinder
1
c
C
Make sure the piston rings are properly
positioned. Install the cylinder with one
hand while compressing the piston rings
with the other hand.
NOTE:
After installing, check the smooth movement of
the piston.
3. Install:
9
Nut (cylinder)
1
NOTE:
Tighten the nuts in stage, using a crisscross pat-
tern.
3. Install:
9
Piston
1
9
Piston pin
2
9
Piston pin clip
3
NOTE:
9
The arrow
a
on the piston dome must point to
exhaust side.
9
Before installing the piston pin clip, cover the
crankcase with a clean rag to prevent the pis-
ton pin clip from falling into the crankcase cavi-
ty.
c
C
Do not allow the clip open ends to meet the
piston pin slot
b
b
.
42 Nm (4.2 m•kg, 30 ft•lb)
1P8-9-32-4b 4/6/06 2:12 PM Page 6
Summary of Contents for YZ250(W)/W1
Page 78: ...2 11 MAINTENANCE SPECIFICATIONS SPEC MEMO...
Page 594: ...TUN MEMO...
