Yamaha YZ-Serie Fahrer- Und Wartungshandbuch Seite 238

CYLINDER HEAD, CYLINDER AND PISTON
5PA40570
5PA40580
5PA40590
Piston ring
1. Install:
Piston ring
G
Into the cylinder.
Push the ring with the piston crown.
2. Measure:
End gap
G
Use a thickness gauge 1.
Out of limit → Replace.
Ring end gap (installed):
0.30 ~ 0.45 mm
(0.012 ~ 0.018 in)
<Limit>: 0.80 mm (0.031 in)
3. Measure:
Side clearance
G
Use a thickness gauge 1.
Out of limit → Replace piston and/or ring.
Side clearance:
0.030 ~ 0.065 mm
(0.001 ~ 0.003 in)
<Limit>: 0.1 mm (0.004 in)
NOTE:
Check at several points.
Piston clearance
1. Calculate:
Piston clearance
G
Out of limit → Replace piston, and piston
ring and/or cylinder.
Refer to "Cylinder" and "Piston".
PISTON
=
CLEARANCE
4 - 21
ENG
CYLINDER PISTON
–
BORE DIAMETER