Yamaha F50D, Руководство по обслуживанию

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A
Checking the piston ring end gap
1. Level the piston ring
1
in the cylinder
with the piston crown.
2. Measure the piston ring end gap
a
at
the specified measuring point
b
.
Checking the piston ring groove
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.
Piston ring dimensions:
Top ring
a
:
B: 1.170–1.190 mm (0.0461–0.0469 in)
T: 2.250–2.450 mm (0.0886–0.0965 in)
Second ring
b
:
B: 1.470–1.490 mm (0.0579–0.0587 in)
T: 2.400–2.600 mm (0.0945–0.1024 in)
Oil ring
c
:
B: 2.340–2.460 mm (0.0921–0.0969 in)
T (reference data):
2.750 mm (0.1083 in)
B
B
B
T T
T
a
b
c
a
b
1
Piston ring end gap (reference data)
a
:
Top ring:
0.150–0.300 mm (0.0059–0.0118 in)
Second ring:
0.300–0.500 mm (0.0118–0.0197 in)
Oil ring:
0.200–0.700 mm (0.0079–0.0276 in)
Measuring point
b
: 20.0 mm (0.8 in)
Piston ring groove:
Top ring
a
:
1.230–1.250 mm (0.0484–0.0492 in)
Second ring
b
:
1.520–1.540 mm (0.0598–0.0606 in)
Oil ring
c
:
2.510–2.530 mm (0.0988–0.0996 in)
a
b
c
Cylinder block