CHAPTER 3B ENGINE 50cc/80cc ATV SERVICE MANUAL09.0
CHAPTER 3B ENGINE PAGE 3B - 24 -
3.4 Driving belt device ＆ the starting lever
3.4.1 Important points
·This chapter is about the driving unit, the clutch / driven unit and the starting lever.
The assembly and disassembly of the driving unit can be done without dismounting the engine.
· The surface of the driving belt and the drive units are not allowed any oil, if there is any, remove it to
minimize the slip between the belt and the drive units.
Tech Criterion Unit. mm
Item Normal Size
Max Service
Allowance
ID of the driving pulley 20.0-20.012 20.062
OD of the driving pulley sleeve 19.947-19.96 19.9
Width of the driving belt 18 17
Thickness of the clutch brake lining 2.0
ID of the clutch housing 106.9-107.1 107.5
Free length of the driven belt spring 92.5 87.2
OD of the transmission pulley 33.955-33.98 33.93
ID of the transmission pulley 33.995-34.03 34.06
OD of the roller 15.9-16.1 15.4
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