Yamaha 1999 XVS1100, Service Manual

Page: 136 / 355

4-31
CYLINDER AND PISTONS
ENG
NOTE:
NOTE:
NOTE:
EB404410
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
0.04
0.08 mm
<Limit>: 0.1 mm
2nd ring
0.03
0.07 mm
<Limit>: 0.1 mm
2. Install:
piston ring
(into the cylinder)
Using the piston crown pash the ring into the cyl-
inder so that the ring will be at a right angle to the
cylinder bore.
a 40 mm from the top of the cylinder
3. Measure:
piston ring end gap
Out of specification
Replace the piston ring.
The oil ring expander spacer’s end gap cannot
be measured. If the oil ring rail’s gap is exces-
sive, replace all three piston rings.
Piston ring end gap
Top ring
0.3 0.5 mm
<Limit>: 0.8 mm
2nd ring
0.3 0.45 mm
<Limit>: 0.8 mm
Oil ring
0.2 0.7 mm