| Item | Part No. | Part Name | Qty | Serial No. |
| 6746-11-1210 | Cylinder Head Assembly | 21857401- | ||
| Head Assembly | 21857401- | |||
| 1 | 6742-01-2920 | Plug | 21857401- | |
| 2 | 6735-21-5531 | Plug, Expansion | 21857401- | |
| 3 | 6745-19-4210 | Insert, Intake | 21857401- | |
| 3 | 6745-18-4210 | Insert, Intake, Oversize 0.25mm | 21857401- | |
| 4 | 6745-49-4130 | Guide | 21857401- | |
| 5 | 6744-41-4110 | Plug | 21857401- | |
| 6 | 6744-11-1070 | Plug | 21857401- | |
| 7 | 6744-41-4120 | Plug | 21857401- | |
| 8 | 6754-11-1160 | Plug | 21857401- | |
| 9 | 6745-19-4220 | Insert, Exhaust | 21857401- | |
| 6745-18-4220 | Insert, Exhaust, Oversize 0.25mm | 21857401- | ||
| 10 | Head, Cylinder | 21857401- | ||
| 11 | 6732-11-1910 | Plug | 21857401- | |
| 12 | 6732-11-1920 | Plug | 21857401- | |
| 6732-21-1960 | Plug Assembly | 21857401- | ||
| 13 | 6215-81-9510 | Plug | 21857401- | |
| 14 | 6735-21-1970 | O-Ring | 21857401- | |
| 15 | 6746-41-4210 | Seal | 21857401- | |
| 16 | 6732-41-4520 | Collet | 21857401- | |
| 17 | 6746-41-4120 | Valve, Intake | 21857401- | |
| 18 | 6732-41-4520 | Collet | 21857401- | |
| 19 | 6746-41-4110 | Valve, Exhaust | 21857401- | |
| 20 | 6744-41-4033 | Spring | 21857401- | |
| 21 | 6744-41-4050 | Retainer | 21857401- | |
| 22 | 6743-11-1610 | Bolt | 21857401- | |
| 23 | 6746-11-1180 | Gasket | 21857401- |