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Trouble shooting
Shift difficulties
1.
shift fork bending
2.
shift fork shaft bending
Transmission jumper
1.
gear forepaw worn
2.
shift fork bent or worn
3.
shift fork shaft bent
Crankshaft noise
1. connecting rod large end bearing worn
2. connecting rod bent
3. crankshaft bearing worn
Noise from gear shift
1. gear shift gear worn
2. spline shaft worn
Crankcase decomposition
1. Place the engine left crankcase upward;
2. Remove 8pcs of GB/T16674 small disc bolts M6×65 and 5pcs of GB/T16674 small disc bolts M6×45
fastening screws, separate the left crankcase from the right crankcase and remove 2pcs of positioning pins.
Crankshaft, balance shaft, main and counter shaft disassembly
Remove the crankshaft assembly, balance shaft, fork shaft, fork, variable speed drum, main and secondary shaft
assembly from the box.
Note
：
Make sure there are no spare parts left behind when
assembling the main and counter shaft.
Inspection of crankshaft
Place the crankshaft on the v type iron.
Use a percentile to measure the radial clearance of the
crankshaft shaft diameter.
The actual radial clearance of the crankshaft is 1/2 of
total read value (TIR)
Maintenance threshold: 0.1mm
Measure radial clearance of two points in the X and Y
direction of the connecting rod head.
Maintenance threshold
：
0.02 mm
