Disassembling The Crankshaft; Checking The Piston Diameter - Yamaha E115A Service Manual

Disassembling the crankshaft

1. Remove the seal rings 1.
a
NOTE:
To remove the seal rings 1, widen the seal
ring end gap a, and then remove the ring
from the groove and remove the crankpin b.
2. Remove the circlip 2, and then remove
the ball bearing.
cC
Do not reuse the ball bearing, always
replace it with a new one.
Gear puller 3: 90890-06540
Bearing separator 4:
90890-06534
61U5H11
1
b
61U50290
2
6G450390
4
3
6G450400

Checking the piston diameter

1. Measure the piston outside diameter at
the specified measuring point. Replace
the piston and piston rings as a set if out
of specification.
a
b
Piston diameter a:
89.920–89.935 mm
(3.5402–3.5407 in)
Measuring point b:
10.0 mm (0.39 in)
Oversize piston diameter a:
1st:
90.170–90.185 mm
(3.5500–3.5506 in)
2nd:
90.420–90.435 mm
(3.5598–3.5604 in)
Crankcase
1
2
3
6G450410
4
5
6
7
8
9
5-36