Yamaha FX Nytro FX10X, Service Manual

Page: 500 / 859

5-59
ENG
CONNECTING RODS AND PISTONS
INSPECTION
1. Inspect:
• Piston wall
• Cylinder wall
Vertical scratches
→
Replace the crankcase,
and replace the piston and piston rings as a
set.
2. Measure:
• Piston-to-cylinder clearance
Measurement steps:
1st step:
• Measure cylinder bore “C” with the cylinder bore
gauge
1
.
NOTE:
Measure cylinder bore “C” by taking side-to-side
and front-to-back measurements of the cylinder.
Then, find the average of the measurements.
Cylinder bore “C”
82.000 ~ 82.010 mm
(3.2283 ~ 3.2287 in)
Taper limit “T” 0.050 mm (0.0020 in)
Out of round “R” 0.050 mm (0.0020 in)
• If out of specification, replace the crankcase,
and the piston and piston rings as a set.
“C” = maximum of D
1
~ D
6
“T” = maximum of D
1
or D
2
– maximum of D
5
or D
6
“R” = maximum of D
1,
D
3
or D
5
– maximum of
D
2,
D
4
or D
6