3-21 ENGINE
As a result of the above measurement, if the piston-
to-cylinder clearance exceeds the following limit,
overhaul the cylinder and use an oversize piston, or
replace both cylinder and piston. The measurement
for the bore diameter should be taken in the intake-
to-exhaust port direction and at 20mm from cylinder
top surface.
■
DE-CARBONING
De-carbon the piston and piston ring grooves, as illus-
trated. After cleaning the grooves, fit the rings and
rotate them in their respective grooves to be sure that
they move smoothly.
Carbon in groove is liable to cause the piston ring to
get stuck in the groove, and this condition will lead to
reduced engine power output.
A piston whose sliding surface is badly grooved or
scuffed due to overheating must be replaced. Shallow
grooves or minor scuff can be removed by grinding with
emery paper of about #400.
■
PISTON PIN BORE I.D.
Using a caliper gauge, measure the piston pin bore
inside diameter. If reading exceeds the following ser-
vice limit, replace it with a new one.
Standard
Service limit
Service limit
10.030 mm (0.395 in)
Piston pin bore I.D.
Dial calipers : 09900-20605
Cylinder to piston
clearance
Piston diameter
Cylinder bore
41.005~41.020mm
(1.6144~1.6150 in)
40.935~40.950mm
(1.6116~1.6122 in)
0.065 ~ 0.075mm
(0.0026~0.0030 in)
41.070mm
(1.6169 in)
40.885mm
(1.6097 in)
0.120mm
(0.0047 in)
Summary of Contents for WOW 50
Page 1: ...SERVICE MANUAL 99000 93110 SERVICE MANUAL HYOSUNG MOTORS MACHINERY INC ...
Page 5: ......
Page 12: ...EXTERIOR ILLUSTRATION GENERAL INFORMATION 1 6 HEIGHT WIDTH WHEEL BASE LENGTH ...
Page 27: ......
Page 32: ...ENGINE 3 4 ...
Page 42: ...ENGINE 3 14 Front side Rear side Bushing Bushing Crankcase Crankcase ...
Page 71: ......
Page 73: ...4 1 FUEL SYSTEM REMOVAL Remove the front and rear fender CARBURETOR ...
Page 81: ......
Page 93: ...6 1 CHASSIS FRONT WHEEL AND BRAKE ...
Page 111: ......
Page 129: ...7 17 SERVICING INFORMATION B A EMERGENCY SWITCH CASE 09407 18401 ...