| Item | Part No. | Part Name | Qty | Serial No. |
| \0 | (21D-01-00020) | ENGINE, ASSY. | ||
| 1 | YM123900-21000 | CRANKSHAFT, ASSY. | ||
| 3 | YM129900-21200 | GEAR, CRANKSHAFT | ||
| 4 | YM121850-21290 | PIN | ||
| 5 | YM121850-21920 | PIN | ||
| 6 | YM22512-070140 | KEY | ||
| 7 | YM129900-21640 | WASHER | ||
| 8 | YM123900-21650 | PULLEY | ||
| 9 | YM121850-21680 | BOLT | ||
| 10 | YM121850-21130 | BOLT | ||
| 11 | YM123900-21580 | FLYWHEEL, ASSY. | ||
| 13 | YM127410-21480 | GEAR, RING | ||
| 14 | YM123900-22080 | PISTON, ASSY. | ||
| 14 | YM123900-22900 | ASSY, PISTON (+0.25 mm) | ||
| 16 | YM123900-22050 | RING SET, PISTON | ||
| 16 | YM123900-22950 | RING SET (+0.25 mm) | ||
| 22 | YM119173-22300 | PIN | ||
| 23 | YM22252-000370 | RING, SNAP | ||
| 24 | YM123900-23000 | CONNECTING ROD, ASSY. | ||
| 27 | YM123900-23910 | BUSH,IDLE GEAR (REPAIR PART) | ||
| 28 | YM123900-23200 | BOLT | ||
| 29 | YM123900-23600 | BEARING | ||
| 29 | YM123900-23610 | BEARING (--0.25 mm) |