Yamaha TT-R125(S) 2003, Owner'S Service Manual

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ENG
CYLINDER AND PISTON
ASSEMBLY AND INSTALLATION
Piston ring and piston
1. Install:
●
Piston rings
(onto the piston)
NOTE:
●
Be sure to install the 2nd piston ring so that
the manufacturer’s mark or number are
located on the upper side of the ring.
●
Lubricate the piston and piston rings liberally
with engine oil.
2. Position:
●
Top ring
●
2nd ring
●
Oil ring
Offset the piston ring end gaps as
shown.
a
: Top ring end
b
: 2nd ring end
c
: Oil ring end (upper)
d
: Oil ring end (lower)
3. Install:
●
Piston 1
●
Piston pin
2
●
Piston pin clips 3
NOTE:
●
Apply engine oil onto the piston pin, piston
rings and piston.
●
Be sure that the arrow mark
a
on the piston
points to the exhaust side of the engine.
●
Before installing the piston pin clip, cover the
crankcase with a clean rag to prevent the
piston pin clip from falling into the crankcase.
●
When removing the piston pin clip, pop it out
using the small opening
b
.
4. Lubricate:
●
Piston
●
Piston rings
●
Inside of cylinder
NOTE:
Apply a liberal coating of engine oil.
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