Genuine Scooter Company Buddy 170, Service Manual

Page: 68 / 137

(6)Cylinder and piston
A.Trouble shooting
B.The Operation notice
C.Data
D.Dismaniling cylinder, piston
E.Installing cylinder, piston
C.Data ()
Part name /description
Standard value
( mm )
Limit of use
( mm )
Bore 61.000~61.010 61.10
Curve
- 0.05
Cylindrility
- 0.05
Cylinder
Roundness - 0.05
lst ring 0.02~0.06 0.10
Clearance b/w Piston and
Piston ring
2
nd
ring 0.01~0.05 0.10
lst ring 0.15~0.35 0.50
2
nd
ring 0.15~0.35 0.50
Clearance of cutting
section
side ring 0.2~0.7 0.9
Piston outer diameter
60.980~60.960 60.90
Measuring location of piston outer dia.
Down to7.5mm from the
piston skirt
---
Clearance b/w piston and cylinder
0.025~0.035 0.10
Piston/
Piston ring
Piston pin hole inner dia 15.000~15.006 15.045
Piston pin outer diameter
15.000~14.994 14.960
Clearance between piston and piston pin
0.020~0.017 0.025
Connecting rod small end inner dia
15.010~15.028 15.060
64