Yamaha YP250R 2005 Service Manual page 228

120˚
e
120˚ 120˚
f f
d b
c
È
CYLINDER AND PISTON
2. Install:
NOTE:
• Apply engine oil to the piston pin.
• Make sure the arrow mark a on the piston
• Before installing the piston pin clip, cover the
3. Install:
4. Lubricate:
5. Offset:
a
a Top ring
b Upper oil ring rail
c Oil ring expander
d Lower oil ring rail
e 2nd ring
f 20 mm (0.79 in)
È Intake side
6. Install:
NOTE:
• While compressing the piston rings with one
• Pass the timing chain and timing chain guide
5 - 35
• piston 1
• piston pin 2
• piston pin clips 3
points towards the exhaust side of the cylin-
der.
crankcase opening with a clean rag to pre-
vent the clip from falling into the crankcase.
• dowel pins
• cylinder gasket
New
• piston
• piston rings
• cylinder
(with the recommended lubricant)
Recommended lubricant
Engine oil
• piston ring end gaps
• cylinder
hand, install the cylinder with the other hand.
(intake side) through the timing chain cavity.
ENG
New