
| Reference | Part# | Description |
| 38 | YC50-20-38 | bolt GB5787 (M6×32) |
| 39 | YC50-20-39 | cylinder |
| 40 | YC50-20-40 | Cylinder Gasket. Φ60mm |
|
41
|
YC50-20-41 | top piston ring(φ44) |
|
41
|
YC50-20-42 | lower piston ring(φ44) |
| 41 | YC50-20-43 | oil seal piston ring(φ44) |
| 44 | YC50-20-44 | piston pin |
| 45 | YC50-20-45 | valve ejector push rod |
| 46 | YC50-20-46 | piston axle(φ13×33) |
| 47 | YC50-20-47 | piston (φ44) |