Hartford Industrial Co., Ltd.
NO
CG
4.Cylinder,cylinder
head,valves and piston
Page
4-2
4.2Specifications
Part
Item
Specification
Service limit
Rocker arms
Inner diameter
12.000~12.018mm
12.1mm
Rocker spindle
Outer diameter
11.984~11.966mm
12.0mm
Pushrod
Cup radius and length
6.5mm/141.5mm
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Outer valve spring
Free length
40.9mm
39.7mm
Inner valve spring
Free length
33.5mm
32.5mm
Outer valve spring
Pressure @ length
15.6kg/35.4mm
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Inner valve spring
Pressure @ length
7.1kg/30.7mm
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Inlet valve stem
Diameter
5.450~5.465mm
5.42mm
Exhaust valve stem
Diameter
5.430~5.445mm
5.40mm
Inlet valve guide
Inside diameter
5.484~5.488mm
5.50mm
Exhaust valve guide
Inside diameter
5.484~5.488mm
5.50mm
Inlet valve to guide
Clearance
0.010~0.035mm
0.08mm
Exhaust valve to guide
Clearance
0.030~0.035mm
0.10mm
Cylinder(125cc)
Bore
56.500~56.513mm
56.6mm
Out of round
-------------------
0.05mm
Obliqueness
-------------------
0.05mm
Cylinder (150cc)
Bore
62.000~62.013mm
62.1mm
Out of round
--------------------
0.05mm
Obliqueness
--------------------
0.05mm
Piston(125cc)
Diameter
56.460~56.480mm
56.360mm
Piston pin hole
Diameter
15.002~15.008mm
15.05mm
Piston pin
Outer diameter
14.993~15.00mm
14.85mm
Piston / bore
0.020~0.050mm
0.11mm
Piston(150cc)
Diameter
61.990~61.970mm
61.890mm
Piston pin hole
Diameter
15.002~15.008mm
15.05mm
Piston pin
Outer diameter
14.993~15.00mm
14.85mm
Piston / bore
0.020~0.050mm
0.11mm
Piston ring to Clearance 1
st
0.025~0.055mm
0.13mm
2
nd
0.015~0.045mm
0.12mm
Installed end gap
1
st
0.15~0.35mm
0.5mm
2
nd
0.15~0.30mm
0.5mm
Oil ring
0.20~0.50mm
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Piston Thickness
1
st
1.160~1.185mm
1.15mm
2
nd
1.175~1.190mm
1.16mm