Yamaha 2008 Raptor 250, Руководство по обслуживанию

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ENG
4-34
f. If out of specification, rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
CHECKING THE PISTON RINGS
1. Measure:
• Piston ring side clearance
Out of specification
→
Replace the piston
and piston rings as a set.
NOTE: NOTE:
Before measuring the piston ring side clear-
ance, eliminate any carbon deposits from the
piston ring grooves and piston rings.
Piston-to-cylinder clearance
0.010 ~ 0.025 mm
(0.0004 ~ 0.0010 in)
Limit
0.15 mm (0.006 in)
Piston ring
Top ring
Ring side clearance
0.030 ~ 0.065 mm
(0.0012 ~ 0.0026 in)
Limit
0.115 mm (0.0045 in)
2nd ring
Ring side clearance
0.020 ~ 0.055 mm
(0.0008 ~ 0.0022 in)
Limit
0.115 mm (0.0045 in)
CYLINDER AND PISTON