CHAPTER 3B ENGINE 50cc/80cc ATV SERVICE MANUAL09.0
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
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