| Item | Part No. | Part Name | Qty | Serial No. |
| 1 | YM129367-22090 | PISTON ASS'Y | 20425- | |
| 1 | \6\ | PISTON | 20425- | |
| 2 | YM729350-22500 | PISTON RING ASS'Y | 20425- | |
| 2 | \6\ | RING,TOP | 20425- | |
| 3 | \6\ | RING,SECOND | 20425- | |
| 4 | \6\ | RING,OIL | 20425- | |
| 5 | YM103338-22300 | PIN,PISTON | 20425- | |
| 6 | YM121100-22400 | RING,SNAP | 20425- | |
| 7 | YM729350-23100 | CONNECTING ROD A. | 20425- | |
| 7 | \6\ | ROD,CONNECTING | 20425- | |
| 8 | YM129350-23100 | BUSHING | 20425- | |
| 9 | YM124060-23300 | CRANK PIN METAL A.,CRANK PIN (STD) | 20425- | |
| 9 | YM724046-23610 | METAL,CRANK PIN¤ 0.25MM (US) | 20425- | |
| 10 | YM104500-23201 | BOLT | 20425- |