Yamaha BEARTRACKER YFM250XC, Руководство по обслуживанию

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ENG
INSPECTION AND REPAIR
●
Oil control ring
Expander spacer of bottom ring (oil con-
trol ring) is color-coded to identify sizes.
Size Color
Oversize 2 Blue
Oversize 4 Yellow
Piston pin
1.Inspect:
●
Piston pin
Blue discoloration/Grooves
→
Replace
then inspect lubrication system.
2.Measure:
●
Outside diameter
a
(piston pin)
Out of specification
→
Replace.
3.Measure:
●
Piston pin bore inside diameter
b
(piston)
Out of specification
→
Replace.
4.Measure:
●
Piston pin-to-piston clearance
Out of specification
→
Replace piston.
Outside diameter (piston pin):
15.991 ~ 16.000 mm
(0.6296 ~ 0.6299 in)
Piston pin bore inside diameter
(piston):
16.002 ~ 16.013 mm
(0.63 ~ 0.6304 in)
Piston pin-to-piston clearance =
Bore size (piston)
b
–
Outside diameter (piston pin)
a
Piston pin-to-piston clearance:
0.002 ~ 0.022 mm
(0.0001 ~ 0.0009 in)
<Limit> 0.07 mm (0.003 in)
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