Checking The Piston Ring Side Clearance; Checking The Piston Pin Boss Bore; Checking The Piston Pin; Checking The Internal Anodes - Yamaha E40G 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:
0.02—0.06 mm
(0.0008—0.0024 in)
2nd piston ring:
0.03—0.07 mm
(0.0012—0.0028 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:
19.904—19.915 mm
(0.7836—0.7841 in)

Checking the piston pin

1. Measure the piston pin outside diameter.
Replace if out of specification.
6F65G11
6F650440

Checking the internal anodes

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.
cC
Do not oil, grease, or the anodes, other-
wise they will not be able to prevent gal-
vanic corrosion effectively.
6F650450

Disassembling the crankshaft

1. Remove the upper and lower bearings.
Piston pin diameter:
19.895—19.00 mm
(0.7833—0.7835 in)
Bearing separator: 90890-06534
Crankcase
1
2
6B450530
3
4
5
6
6F650455
7
8
9
6B450545
5-30