Checking The Piston Diameter; Checking The Cylinder Bore; Checking The Piston Ring - Yamaha F225F Service Manual

Bearing splitter plate i:
(commercially available)
Gear puller j: (commercially available)
General cylindrical tool k:
d = 19 mm (0.7 in)
e = 90 mm (3.5 in)
5. Remove the piston pin clips l and piston
pin m, and then remove the connecting
rod f.
l
m
f
TIP:
• Remove the piston pin from the side
marked with g.
• Make sure to keep the parts in the order of
removal.
6. Remove the piston rings.

Checking the piston diameter

1. Measure the piston diameter a at the
specified measuring point b.
b
a
g
l
Piston diameter a:
95.945–95.960 mm
(3.7774–3.7779 in)
Measuring point b:
13.500 mm (0.5315 in) up from the
bottom of the piston skirt

Checking the cylinder bore

1. Measure the cylinder bore (D
measuring points a, b, and c, and in
direction d (D
, D
1 3
to the crankshaft, and direction e (D
D , D ), which is at a right angle to the
4 6
crankshaft.
a
b
D
2
c
D
4
D
6
a 10.0 mm (0.39 in)
b 77.0 mm (3.03 in)
c 106.0 mm (4.17 in)
Cylinder bore (D –D ):
1 6
96.000–96.012 mm
(3.7795–3.7800 in)

Checking the piston ring

1. Measure piston ring dimensions B and T.
a
B
T
c
T
Cylinder block
–D ) at
1 6
, D ), which is parallel
5
,
2
D
1
d
D
3
e
D
5
b
B
T
B
7-78
0
1
2
3
4
5
6
7
8
9
10
A