Yamaha XF50W Service Manual page 191

CYLINDER AND PISTON
e. Calculate the piston-to-cylinder clearance
with the following formula.
Piston-to-cylinder clearance =
Cylinder bore "C" -
Piston skirt diameter "P"
Piston-to-cylinder clearance
0.010 ~ 0.035mm(0.0004 ~
0.0014in)
<Limit>:0.15mm(0.0059in)
f. If out of specification, rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
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ENG
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