| Item | Part No. | Part Name | Qty | Serial No. |
| YM729367-22090 | PISTON ASS'Y | 28530- | ||
| YM129367-22090 | PISTON ASS'Y | 18873-28529 | ||
| 1 | \6\ | PISTON | 18873- | |
| YM729350-22501 | PISTON RING ASS'Y | 28530- | ||
| YM729350-22500 | PISTON RING ASS'Y | 18873-28529 | ||
| 2 | \6\ | RING,TOP | 18873- | |
| 3 | \6\ | RING,SECOND | 18873- | |
| 4 | \6\ | RING,OIL | 28530- | |
| 4 | \6\ | RING,OIL | 18873-28529 | |
| 5 | YM103338-22300 | PIN,PISTON | 18873- | |
| 6 | YM103338-22400 | RING,SNAP | 18873- | |
| YM729350-23100 | CONNECTING ROD A. | 18873- | ||
| 7 | \6\ | ROD,CONNECTING | 18873- | |
| 8 | YM129350-23100 | BUSHING | 18873- | |
| STANDARD | ||||
| 9 | YM124060-23300 | CRANK PIN METAL A. | 18873- | |
| UNDERSIZE 0.25MM | ||||
| 9 | YM724064-23610 | METAL ASS'Y | 18873- | |
| 10 | YM104500-23201 | BOLT | 18873- |