Yingang YG125-25, Maintenance Manual

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YG125-25 Maintenance Manual Crankcase, crankshaft and Shift mechanism
Troubleshooting

Noise from engine
1. Crankshaft bearing worn;
2. Connecting rod big end bearing worn;
3. Driving/driven shaft bearings worn;
4. Balance shaft supplementary tooth spring failure.

Driving/driven shaft gears engaged badly
1. Shift fork bent or damaged;
2. Shift fork shaft bent;
3. Gearshift drum badly machined or bearing shifted;
4. Driving/driven shaft bearings shifted.

Gear shift trouble
1. Shift fork bent or damaged;
2. Shift fork shaft bent;
3. Gearshift drum guiding slot worn or damaged;
4. Clutch improperly adjusted.
5. Locking plate bend or fray
；
6. Five star plate assy broken
7. Pin broken or slip off

Gear shaft cannot return back
1. Sping broken or slip off
2. Variable-speed shaft plate interfere crankcase or crankcase cover
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