
| Reference | Part# | Description |
| 1 | YC50-20-1 | bolt GB5787(M6×20) |
| 2 | YC50-20-2 | washer φ6 |
| 3 | YC50-20-3 | bolt GB5787(M6×30) |
| 4 | YC50-20-4 | cylinder head cover |
| 5 | YC50-20-5 | cylinder head cover gasket |
| 6 | YC50-20-6 | locating stud φ8×10 |
| 7 | YC50-20-7 | locating stud φ3×5.5 |
| 8 | YC50-20-8 | bolt GB5787 M6×100 |
| 9 | YC50-20-9 | bolt GB5787 M6×110 |
| 10 | YC50-20-10 | bolt GB5787 M6×75 |
| 11 | YC50-20-11 | valve stem locking piece |
| 12 | YC50-20-12 | valve spring retainer |
| 13 | YC50-20-13 | valve spring |
| 14 | YC50-20-14 | valve stem oil seal |
| 15 | YC50-20-15 | intake valve |
| 16 | YC50-20-16 | exhaust valve |
| 17 | YC50-20-17 | cylinder head |
| 18 | YC50-20-18 | cushion pad |
| 19 | YC50-20-19 | spark plug |
| 20 | YC50-20-20 | rocker arm shaft screw M6×20 |
| 21 | YC50-20-21 | socket head cap screw |
| 22 | YC50-20-22 | valver rocker |
| 23 | YC50-20-23 | locating stud φ6×10 |
| 24 | YC50-20-24 | valve ejector shaft |
| 25 | YC50-20-25 | intake pipe paper gasket |
| 26 | YC50-20-26 | intake pipe isolating gasket |
| 27 | YC50-20-27 | bolt GB5787 (M6×25) |
| 28 | YC50-20-28 | intake pipe |
| 29 | YC50-20-29 | carburettor paper gasket |
| 30 | YC50-20-30 | carburettor isolating gasket |
| 31 | YC50-20-31 | carburettor |
| 32 | YC50-20-32 | gas filter |
| 33 | YC50-20-33 | bolt GB70.1 (M6×25) |
| 34 | YC50-20-34 | exhaust pipe washer |
| 35 | YC50-20-35 | locating stud φ8×12 |
| 36 | YC50-20-36 | Cylinder Gasket. Φ40mm |
| 37 | YC50-20-37 | washer M6 |