58
C
77.50—77.51
80.22—80.23
80.225—80.235
Standard
77.21—77.235
79.93—79.955
79.965—79.975
Oversize
0.29
77.49—77.515
80.21—80.235
80.245—80.255
Oversize
0.5
77.71—77.735
80.43—80.455
80.465—80.475
——Measure the diameter of cylinder bore. Unit: mm
480 cylinder bore
Factory
group
1
79.94—79.95
2
79.95—79.96
3
79.96—79.97
4
79.97—79.98
Factory
repair
A
80.23—80.24
B
80.24—80.25
C
80.25—80.26
For
mainte
nance
Standard
79.965—77.975
Oversize
0.29
80.245—80.255
Oversize
0.5
80.466—80.475
Fig.75
Fig.76
——Grind the cylinder bore with the service gauge and the
figured twins angle is 50
°
—60
°
.
——Measure the diameter of each piston of the carburetor
engine. Measurement should be taken at the position 10mm to the bottom skirt. For 480E piston,
measurement should be taken at the position 19mm to the bottom skirt.
Unit
：
mm
478 dia. of piston skirt (mm)
488 dia. of
piston skirt
(mm)
480E *dia. of
piston skirt (mm)
1
77.19—77.20
79.91—79.92
79.915—79.925
Factory
2
77.20—77.21
79.92—79.93
79.925—89.935
group
3
77.21—77.22
79.93—79.94
79.935—79.945
4
77.22—77.23
79.94—79.95
79.945—79.955
A
77.48—77.49
80.20—80.21
80.205—80.215
Factory
B
77.49—77.50
80.21—80.22
80.215—80.225
repair
Spare
parts
