Yamaha F100C, Service Manual

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Checking the piston ring grooves
1. Measure the piston ring grooves.
Replace the piston if out of specification.
Checking the piston ring side
clearance
1. Measure the piston ring side clearance.
Replace the piston and piston rings as a
set if out of specification.
Checking the crankshaft
1. Measure the crankshaft journal diameter
a
, crank pin diameter
b
, and crank pin
width
c
. Replace the crankshaft if out of
specification.
Piston ring groove:
Top ring
a
:
1.23–1.25 mm
(0.0485–0.0492 in)
Second ring
b
:
1.52–1.54 mm
(0.0599–0.0606 in)
Oil ring
c
:
2.51–2.53 mm
(0.0989–0.0996 in)
S60C5860
S60C5870
Piston ring side clearance:
Top ring
a
:
0.04–0.08 mm
(0.0016–0.0031 in)
Second ring
b
:
0.03–0.07 mm
(0.0012–0.0027 in)
Oil ring
c
:
0.03–0.15 mm
(0.0012–0.0059 in)
Crankshaft journal diameter
a
:
47.984–48.000 mm
(1.8892–1.8897 in)
Crank pin diameter
b
:
43.982–44.000 mm
(1.7315–1.7322 in)
Crank pin width
c
:
21.00–21.07 mm
(0.8268–0.8295 in)
Cylinder body