Checking The Piston Rings - Yamaha BT1100 2002 Service Manual

CYLINDER AND PISTONS
EB404410

CHECKING THE PISTON RINGS

1. Measure:
• piston ring side clearance
Out of specification
and piston rings as a set.
NOTE:
Before measuring the piston ring side clearance,
eliminate any carbon deposits from the piston ring
grooves and piston rings.
Piston ring side clearance
Top ring
0.04
<Limit>: 0.1 mm
2nd ring
0.03
<Limit>: 0.1 mm
2. Install:
• piston ring
(into the cylinder)
NOTE:
Using the piston crown pash the ring into the
cylinder 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
NOTE:
The oil ring expander spacer's end gap cannot be
measured. If the oil ring rail's gap is excessive,
replace all three piston rings.
Piston ring end gap
Top ring
0.3
<Limit>: 0.8 mm
2nd ring
0.3
<Limit>: 0.8 mm
Oil ring
0.2
4-31
ENG
Replace the piston
0.08 mm
0.07 mm
Replace the piston ring.
0.5 mm
0.45 mm
0.7 mm