Linhai 2005 ATV 260, Service Manual

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CHAPTER 3B ENGINE 50cc/80cc
ATV SERVICE MANUAL07.0
CHAPTER 3B ENGINE PAGE 3B - 18 -
3.3 The cylinder and the piston
3.3.1 Important points
·
The work on the cylinder and piston can be done on the engine without complete disassemble.
·
After taking them apart, clean and dry the cylinder and piston with the compressed air before measuring
and testing.
Tech criterion
Item Normal Size Max. Service
Allowance
ID(50cc) 39-39.01 39.10
ID(80cc) 47-47.01 47.10
Distortion ------ 0.05
Cylindricity ------ 0.05
Cylinder
Out-of-roundness ------- 0.05
the top ring 0.015-0.055 0.09 Clearance between the
ring and the ring groove
the 2nd ring 0.015-0.055 0.09
the top ring 0.08-0.20 0.45
the 2nd ring 0.05-0.20 0.45
Piston
ring
end gap
the oil side ring 0.20-0.70 -----
OD of piston(50cc) 38.942-38.982 38.9
OD of piston(80cc) 46.963-46.993 46.9
Check point of OD
10mm away from skirt
-----
Piston
Clearance between piston and cylinder 0.010-0.040 0.1