Installing The Piston And Piston Ring - Yamaha MZ250 Service Manual

PISTON, CAMSHAFT, CRANKCASE, AND
1
2
3
CRANKSHAFT
3. Remove:
4. Measure:
TIP
Measure the widest portion of the pressed
Plastigauge
INSTALLING THE PISTON AND PISTON
RING
1. Install:
a
TIP
9 Be sure to install the top ring and second
ring so that the "R" mark a faces toward
the piston head.
9 Make sure that the piston rings move
1
smoothly.
2
2. Apply the engine oil to the inside of the
3
3-45
ENG
9 Connecting rod cap
9 Connecting rod
9 Connecting rod big end oil clearance
Out of specification → Replace crank-
shaft or connecting rod assembly, and
then measure the clearance again.
.
®
Connecting rod big end oil clear-
ance:
Refer to "SPECIFICATIONS" in
the Supplementary service
manual.
Limit:
Refer to "SPECIFICATIONS" in
the Supplementary service
manual.
9 Top ring 1
9 2nd ring 2
9 Oil ring 3
connecting rod small end.