Yamaha F350B - Checking the Cylinder Bore; Checking the Piston Diameter

7-73
Cylinder block
5. Remove:
• Piston pin clip “1”
• Piston pin “2”
• Connecting rod “3”
TIP:
• Remove the piston pin from the side marked
with “a”.
• Make sure to keep the parts in the order of re-
moval.
6. Remove:
• Piston ring
Checking the piston diameter
1. Measure:
• Piston diameter “a”
(at the specified measuring point “b”)
Below specification  Replace.
Checking the cylinder bore
1. Measure:
• Cylinder bore (D1–D6)
(at measuring points “a”, “b”, and “c”, and
in directions “d” [D1, D3, D5] and “e” [D2,
D4, D6])
Above specification  Replace the cylin-
der block.
Bearing separator “2”
90890-06534
Gear puller “3”
90890-06540
Needle bearing attachment “4”
90890-06615
Bearing separator “5”
(commercially available)
Gear puller “6”
(commercially available)
Needle bearing remover and in-
staller “7”
YB-06346
1
1
2
3
a
Piston
Diameter
95.945–95.960 mm (3.7774–
3.7779 in)
Limit
95.905 mm (3.7758 in)
Measuring point
18.5 mm (0.73 in)
a. 10.0 mm (0.39 in)
b. 77.0 mm (3.03 in)
c. 106.0 mm (4.17 in)
d. Parallel to the crankshaft
e. At a right angle to the crankshaft
a
b
a
b
c
d
e
D
1
D
2
D
3
D
4
D
5
D
6