| Item | Part No. | Part Name | Qty | Serial No. |
| 1 | YM705100-11700 | CYLINDER HEAD ASS'Y | 2991- | |
| YM705170-11700 | CYLINDER HEAD ASS'Y | 2501-2990 | ||
| 2 | YM105300-11801 | GUIDE,VALVE | 2991- | |
| YM105300-11160 | GUIDE,VALVE | 2501-2990 | ||
| 3 | YM27231-150000 | PLUG | 2501- | |
| 4 | YM105300-11330 | PIN | 2501- | |
| 5 | YM105100-11100 | VALVE,SUCTION | 2991- | |
| YM105170-11100 | VALVE,SUCTION | 2501-2990 | ||
| 6 | YM105100-11111 | VALVE,EXHAUST | 2991- | |
| YM105170-11110 | VALVE,EXHAUST | 2501-2990 | ||
| 7 | YM105400-11121 | SPRING,VALVE | 2991- | |
| YM101158-11120 | SPRING,VALVE | 2501-2990 | ||
| 8 | YM101158-11180 | SEAT,SPRING | 2501- | |
| 9 | YM101158-11190 | COTTER | 2501- | |
| 10 | YM26216-080452 | STUD | 2501- | |
| 11 | YM26366-080002 | NUT | 2501- | |
| 12 | YM105215-01200 | STUD | 2501- | |
| 13 | YM121450-01220 | NUT | 2501- | |
| 14 | YM26216-060402 | STUD | 2991- | |
| YM26216-080702 | STUD | 2501-2990 | ||
| 15 | YM26366-060002 | NUT | 2991- | |
| YM26366-080002 | NUT | 2501-2990 | ||
| 16 | YM105100-01330 | GASKET | 2501- | |
| 17 | YM105010-11920 | COCK | 2501- |