Yamaha YZ250X 2022 Owner's Service Manual page 175

2. Install:
• Cylinder gasket "1"
New
• Small end bearing "2"
(with the recommended lubricant)
• Dowel pin "3"
Recommended lubricant
Engine oil
3. Install:
• Piston "1"
• Piston pin "2"
• Piston pin clip "3"
New
TIP
• Apply engine oil the piston pin.
• Make sure the arrow mark "a" on the piston
points towards the exhaust side of the cylinder.
• Before installing the piston pin clip, cover the
crankcase opening with a clean rag to prevent
the clip from falling into the crankcase.
• Do not allow the clip open ends to meet the pis-
ton pin slit "b".
CYLINDER HEAD, CYLINDER AND PISTON
4. Lubricate:
• Piston
• Piston ring
• Cylinder
(with the recommended lubricant)
5. Install:
• Cylinder "1"
• Cylinder nut "2"
TIP
• While compressing the piston ring with one
hand, install the cylinder with the other hand.
• Tighten the nuts in stage, using a crisscross
pattern.
6. Install:
• Push rod "1"
5-13
Recommended lubricant
Engine oil
Cylinder nut
42 N·m (4.2 kgf·m, 31 lb·ft)
1
2
2