Yamaha YZF-R6 99, Service Manual

Page: 198 / 400

4-70
CONNECTING RODS AND PISTONS
ENG
NOTE:
NOTE:
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
0.025 0.045 mm
<Limit>: 0.07 mm
f. If out of specification, replace the crank-
cases, and the pistons and piston rings as a
set.
EAS00263
CHECKING THE PISTON RINGS
1. Measure:
piston ring side clearance
Out of specification
Replace the piston
and piston rings as a set.
Before measuring the piston ring side clear-
ance, eliminate any carbon deposits from the
piston ring grooves and piston rings.
Piston ring side clearance
Top ring
0.030 0.065 mm
<Limit>: 0.115 mm
2nd ring
0.020 0.055 mm
<Limit>: 0.115 mm
2. Install:
piston ring
(into the cylinder)
Level the piston ring in the cylinder with the pis-
ton crown.
a 5 mm