LONCIN YF300 - Cylinder body and piston; Notice in maintenance; Summary; Specification of each part

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Cylinder body and piston
Notice in maintenace Disassembly of piston
Troubleshooting Assembly of piston
Disassembly of cylinder Assembly of cylinder
Notice in maintenance
Summary
Well install new washer and positioning pin first before installing cylinder, no dust and impurity
enter crankcase is allowed.
Specification of each part
Items
Standard（mm）
Limit（mm）
Cylinder body
Cylinder bore
78.00～78.01
78.07
Piston
Outer diameter of
piston
77.950～77.97
77.805
Inner diameter of
hole of piston pin
17.002～17.008
17.04
Width of groove of
1
st
ring
1.01～1.03
1.11
Width of groove of
2
nd
ring
1.01～1.03
1.11
Width of groove of
3
rd
ring
2.01～2.03
2.11
Connective rod
Hole diameter of
small end
17.013～17.025
17.05
Piston pin
Outer diameter
16.994.0～17.000
16.96
Clearance between piston and cylinder
0.03～0.06
0.12
Clearance btween piston pin and its hole
0.002～0.014
0.02
Clearance between piston pin and small
end of connective rod
0.013～0.031
0.05
Thickness of piston
rings
1
st
ring
0.97～0.99
0.9
2
nd
ring
0.97～0.99
0.9
Clearance between
piston rings and their
groove
1
st
ring
0.02～0.06
0.16
2
nd
ring
0.02～0.06
0.16
Closure clearance of
piston rings
1
st
ring
0.15～0.3
0.65
2
nd
ring
0.20～0.35
0.7
Oil ring
0.2～ 0.7
1.0