Piston Ring; Piston Clearance - Yamaha YZ85( P) /LC Owner's Service Manual

CYLINDER HEAD, CYLINDER AND PISTON

Piston ring

1. Install:
Piston ring
Into the cylinder.
Push the ring with the piston crown.
2. Measure:
End gap
Use a thickness gauge 1.
Out of limit
5PA40570
3. Measure:
Side clearance
Use a thickness gauge 1.
Out of limit
5PA40580
NOTE:
Check at several points.
5PA40590

Piston clearance

1. Calculate:
Piston clearance
Out of limit
ring and/or cylinder.
Refer to "Cylinder" and "Piston".
PISTON
CLEARANCE
4 - 21
ENG
Replace.
Ring end gap (installed):
0.30 ~ 0.45 mm
(0.012 ~ 0.018 in)
<Limit>: 0.80 mm (0.031 in)
Replace piston and/or ring.
Side clearance:
0.030 ~ 0.065 mm
(0.001 ~ 0.003 in)
<Limit>: 0.1 mm (0.004 in)
Replace piston, and piston
CYLINDER
=
BORE
PISTON
–
DIAMETER