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Table of standard values of baseline projects and allowable limit Unit: mm
Item Standard Allowable limit
Bent axle
connecting rod
assembly, clutch
Clearance between the left and the
right of the big end of the
connecting rod
0.1-0.35 0.5
Connecting rod big end radial
clearance
0.008-0.018 -
Jump - 0.03
Thickness of friction plate 2.8-2.9 2.5
Flatness of running friction plate 0.04 0.2
Length of pressure spring 30.4-31.6 29.7
Thickness of surface needle roller 1.88-2 1.8
Gearshift
mechanism
Outer diameter of shifting fork axis 9.98-9.995 9.96
Diameter of bore of shifting fork 10-10.018 10.05
Thickness of shifting fork 4.8-4.9 4.6
Outer diameter of gearshift hub 41.8-42 41.75
Width of gearshift hub locked
groove
5.45-5.55 5.7
13.2 Fault Diagnosis
Low compression pressure
Crankcase air leakage
Engine overheat
Clutch clipping
Poor lubrication
Failure in gear
Gear shift fork broken or deformation
Shifting fork guide pin broken
Wheel gear convex claw worn
Auto-off gear
The joint claw is worn with the edge into a fillet.
Force of return spring of the speed shifting mechanism is weakened.
The spline tooth of spline shaft and the spline groove of sliding gear are worn, resulting a greater axial force in
the gear while working.
Gearshift hub and shifting fork are worn.
Abnormal sound in the crankcase
There are parts scattered or broken inside the crankcase
Engine stalling
Clutch is stuck
Shifting difficulty
Separation between the clutches is not complete
Poor returning spring of the clutch
Locked grove of the gearshift hub worn
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