Yamaha YZ 2002 Series, Owner'S Service Manual

Page: 266 / 568

4-27
ENG
CYLINDER HEAD, CYLINDER AND PISTON
EC475280
Piston ring and piston
1. Install:
9 Piston ring
1
NOTE:
9 Take care not to scratch the piston or damage
the piston ring.
9 Align the piston ring gap with the pin
2
.
9 After installing the piston ring, check the
smooth movement of it.
2. Install:
9 Gasket (cylinder)
1
9 Small end bearing
2
9 Dowel pin
3
NOTE:
9 Apply the engine oil onto the bearing (crank-
shaft and connecting rod) and connecting rod
big end washers.
9 Install the gasket with the seal print side toward
the crankcase.
3. Install:
9 Piston
1
9 Piston pin
2
9 Piston pin clip
3
NOTE:
9 The arrow
a
on the piston dome must point to
exhaust side.
9 Before installing the piston pin clip, cover the
crankcase with a clean rag to prevent the pis-
ton pin clip from falling into the crankcase cavi-
ty.
c C
9
When installing the piston pin clip, use
the hand so that it may not be distorted.
9
Do not allow the clip open ends to meet
the piston pin slot
b
.