Installing The Piston And Cylinder - Yamaha YFM250RX 2008 Service Manual

CYLINDER AND PISTON

INSTALLING THE PISTON AND CYLINDER

1. Install:
• Lower oil ring rail
• Oil ring expander
• Upper oil ring rail
• 2nd ring
• Top ring
NOTE: NOTE:
Be sure to install the piston rings so that the
"T" marks or numbers face up.
2. Install:
• Piston
• Piston pin
• Piston pin clips
NOTE: NOTE:
• Apply engine oil the piston pin.
• Make sure the dot
towards the exhaust side of the cylinder.
• Before installing the piston pin clip, cover the
crankcase opening with a clean rag to pre-
vent the clip from falling into the crankcase.
3. Install:
• O-ring
• Cylinder gasket
• Dowel pins
4. Lubricate:
• Piston
• Piston rings
• Cylinder
(with the recommended lubricant)
Recommended lubricant
Engine oil
New
4-37
ENG
on the piston points