YG125-30B Maintenance Manual
Crankcase, crankshaft and Shift mechanism
90
Troubleshooting
l
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.
l
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.
l
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
l
Gear shaft cannot return back
1.
Sping broken or slip off
2.
Variable-speed shaft plate interfere crankcase or crankcase cover
Summary of Contents for YG125-30B
Page 99: ...YG125 30B Maintenance Manual Frame and exhaust system 106 10 Frame and exhaust system...
Page 130: ...YG125 30B Maintenance Manual Illumination signal system 136 Circuit schematic drawing...
Page 141: ...YG125 30B Maintenance Manual Engine management system 147 Circuit schematic drawing...
Page 151: ...YG125 30B Maintenance Manual Electrical System Diagram 157 19 Electrical System Diagram...
