Yamaha YZ250(S)/LC Owner's Service Manual page 272

CYLINDER HEAD, CYLINDER AND PISTON
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.
cC
Do not allow the clip open ends to meet the
piston pin slot b b .
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
cC
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.
4-30
ENG
42 Nm (4.2 m•kg, 30 ft•lb)