Disassembling The Cylinder Block; Checking The Piston Diameter - Yamaha F4B Service Manual

Disassembling the cylinder block

1. Remove the dipstick a.
2. Remove the camshaft b, valve lifters c,
and plate d.
c
a
3. Remove the connecting rod cap a, and
then remove the connecting rod and
piston assembly b.
a
4. Remove the washer e, crankshaft f,
and oil seal g.
e
f
g
5. Remove the ball bearing h.
d
Driver rod L3 i: 90890-06652
b
Needle bearing attachment j:
6. Remove the clips k, and then remove
b

Checking the piston diameter

1. Measure the piston diameter a at the
i
j
h
90890-06612
the piston pin l and connecting rod c.
c
specified measuring point b.
a
b
Cylinder block
0
1
2
3
k
4
5
6
l
k
7
8
9
10
A
7-40