B. Troubleshooting.
Engine noise:
1.The bearing of final transmission mechanism is loose.
2.Crank pin bearing is loose.
3.The bearing of gear box is loose.
C. Data
Measuring Item Standard value Limit of use.(mm)
Clearance of connecting rod big end
(Parallel direction to rod)
0.20-0.50 0.71(50cc)
Clearance of connecting rod big end
(Perpendicular direction to rod)
- 0.04
Swingness of the crank shaft neck 0.03 0.10
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