Installing The Piston - Yamaha YFZ450S 2003 Service Manual

a d
90˚
45˚ 45˚
c
3
CYLINDER AND PISTON
EBS00252

INSTALLING THE PISTON

1. Install:
NOTE:
_
• Be sure to install the piston rings so that the
• Lubricate the piston and piston rings liberally
2. Position:
a Top ring end
b 2nd ring end
c Oil ring end (upper)
d Oil ring
b e
e Oil ring end (lower)
3. Install:
NOTE:
_
• Apply engine oil onto the piston pin, piston
• Be sure that the punch mark a on the piston
• Before installing the piston pin clips, cover
• Install the piston clips with their ends facing
New
4 - 40
• piston rings
(onto the piston)
manufacturer's marks
located on the upper side of the rings.
with engine oil.
• top ring
• 2nd ring
• oil ring
Offset the piston ring end gaps as shown.
• piston 1
• piston pin 2
• piston pin clips 3
rings and piston.
points to the exhaust side of the engine.
the crankcase with a clean rag to prevent the
piston pin clips from falling into the crank-
case.
downward.
ENG
or numbers
New
are