Piston Ring And Piston Pin - Yamaha YFM250XL(C) Service Manual

Yfm250xl(c) yamaha
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INSPECTION AND REPAIR
2nd steps
Measure the piston skirt diameter "P"
with a micrometer.
b 4 mm (0.16 in) from the piston bottom edge
Piston skirt Diameter "P"
Standard
Oversize 2
Oversize 4
If out of the specification, replace the pis-
ton and piston rings as a set.
3rd steps
Find the piston-to-cylinder clearance with
following formula.
Piston-to-cylinder clearance =
Cylinder bore "C" –
Piston skirt diameter "P"
Piston-to-cylinder clearance:
0.04 ~ 0.06 mm
(0.0016 ~ 0.0024 in)
< Limit >:
0.15 mm (0.0059 in)
If out of the specification, rebore or
replace the cylinder, and replace the pis-
ton and piston rings as a set.
*********************************

PISTON RING AND PISTON PIN

Piston ring
1.Measure:
Side clearance
Use the Feeler Gauge 1.
Out of specification → Replace piston and/
or rings as a set.
NOTE:
Eliminate carbon deposits from the piston
ring grooves and rings before measuring
the side clearance.
4 - 33
ENG
70.92 ~ 70.97 mm
(2.792 ~ 2.794 in)
71.50 mm (2.815 in)
72.00 mm (2.846 in)
4

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Yfm250xlYfm250xc

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