YCF 50A (Starter/Camshaft/Crankcase)
| Reference | Part# | Description |
| 66 | YC50-20-66 | electric starter |
| 67 | YC50-20-67 | inside rotor |
| 68 | YC50-20-68 | pump axis |
| 69 | YC50-20-69 | outside rotor |
| 70 | YC50-20-70 | washer φ28×9.5×1.0 (T8) |
| 71 | YC50-20-71 | washer φ28×22×0.5 (T8) |
| 72 | YC50-20-72 | bearing 16001 |
| 73 | YC50-20-73 | bearing clamp |
| 74 | YC50-20-74 | bolt GB5787 (M6×12) |
| 75 | YC50-20-75 | Right crankcase |
| 76 | YC50-20-76 | bolt GB5787 (M6×45) |
| 77 | YC50-20-77 | camshaft |
| 78 | YC50-20-78 | timing chain |
| 79 | YC50-20-79 | camshaft clamp |
| 80 | YC50-20-80 | bolt GB5787 (M6×14) |
| 81 | YC50-20-81 | Clutch axle sleeve |
| 82 | YC50-20-82 | Clutch grinding disk |
| 84 | YC50-20-84 | Clutch wearing plate |
| 85 | YC50-20-85 | washer φ22×14×2 (T8) |
| 86 | YC50-20-86 | screw cap GB6170 M14×1.0 |
| 87 | YC50-20-87 | right crankcase cover |
| 87 | YC50-20-87GY | right crankcase cover |
| 88 | YC50-20-88 | bolt GB5787 |
| 89 | YC50-20-89 | bolt GB5787 |
