4-24
ENG
CYLINDER HEAD, CYLINDER AND PISTON
EC474502
Piston ring
1. Install:
9
Piston ring
Into the cylinder.
Push the ring with the piston crown.
2. Measure:
9
End gap
Use a thickness gauge
1
.
Out of limit
→
Replace.
3. Measure:
9
Side clearance
Use a thickness gauge
1
.
Out of limit
→
Replace piston and/or ring.
NOTE:
Check at several points.
Ring end gap (installed):
Standard
<Limit>
0.40~0.55 mm
0.95 mm
(0.016~0.022 in)
(0.037 in)
Side clearance:
Standard
<Limit>
0.030~0.065 mm
0.1 mm
(0.0012~0.0026 in)
(0.004 in)
5. Check:
9
Free play
There should be no noticeable free play.
Free play exists
→
Inspect the connecting
rod for wear/Replace the pin and/or con-
necting rod as required.
1P8-9-31-4A 5/12/05 1:19 PM Page 48
Summary of Contents for YZ250(V)
Page 78: ...2 11 MAINTENANCE SPECIFICATIONS SPEC MEMO...
Page 594: ...TUN MEMO...
