Checking The Piston Ring Side Clearance; Checking The Piston Pin Boss Bore; Checking The Piston Pin; Checking The Internal Anode - Yamaha E115A Service Manual

Checking the piston ring side clear-
ance
1. Measure the piston ring side clearance.
Replace the piston and piston rings as a
set if out of specification.
Piston ring side clearance:
Top ring and 2nd piston ring:
0.02–0.06 mm
(0.0008–0.0024 in)

Checking the piston pin boss bore

1. Measure the piston pin boss bore.
Replace the piston if out of specification.
Piston pin boss bore:
E115A:
21.504–21.515 mm
(0.8466–0.8470 in)
115B, 140B:
23.074–23.085 mm
(0.9084–0.9089 in)
61U5H11

Checking the piston pin

1. Measure the piston pin outside diameter.
Replace the piston pin if out of specifica-
tion.
6G450420

Checking the internal anode

1. Check the anodes on the cylinder block.
Clean the anode's surface and replace if
it has been eroded into half size or small-
er.
6G450430
cC
Do not oil or grease the anodes, otherwise
they will not be able to prevent galvanic
corrosion effectively.
Piston pin diameter:
E115A:
21.495–21.500 mm
(0.8463–0.8465 in)
115B, 140B:
23.065–23.070 mm
(0.9081–0.9083 in)
Crankcase
1
2
3
6S350110
4
5
6
7
61U50670
8
9
5-38