Yamaha MZ250, Service Manual

Page: 80 / 118

3-46
ENG
PISTON, CAMSHAFT, CRANKCASE, AND
CRANKSHAFT
3. Install:
9
Piston
1
9
Piston pin
2
9
Piston pin circlips
3
TIP
9
Make sure that the “YAMAHA” mark
a
on
the connecting rod faces toward the crank-
case cover.
9
Make sure that the “ ” mark
b
on the pis-
ton head faces toward the push rod.
9
Install the piston pin clips so that the clip
ends are 45°
c
or more from the cutout in
the piston.
b
a
1 3
2
45˚
90˚
90˚
90˚
a b
c d
c
1
2
3
INSTALLING THE CRANKSHAFT
1. Make sure that the end gap of each pis-
ton ring is positioned correctly, as shown
in the illustration.
a
Lower oil ring rail
b
2nd ring
c
Upper oil ring rail
d
Top ring, oil ring expander
2. Install:
9
Piston with the connecting rod
1
1