| Item | Part No. | Part Name | Qty | Serial No. |
| YM729350-21700 | CRANKSHAFT ASS'Y | 18873- | ||
| 1 | \6\ | CRANKSHAFT | 18873- | |
| 2 | YM24190-080001 | BALL,STEEL | 18873- | |
| 3 | YM22312-080160 | PIN,DOWEL | 18873- | |
| 4 | YM22512-070180 | KEY | 18873- | |
| STANDARD | ||||
| 5 | (YM129350-02100) | METAL,MAIN, FRONT | 18873- | |
| UNDERSIZE 0.25MM | ||||
| 5 | (YM129350-02310) | METAL,MAIN, FRONT | 18873- | |
| YM729350-02620 | MAIN METAL A.,NO.1 | 18873- | ||
| STANDARD | ||||
| 6 | YM729350-02810 | METAL ASS'Y,NO.1 | 18873- | |
| 6 | \6\ | METAL,MAIN | 18873- | |
| UNDERSIZE 0.25MM | ||||
| 6 | YM129350-02350 | METAL ASS'Y,NO.1 | 18873- | |
| 7 | \6\ | CAP ASS'Y | 18873- | |
| 8 | YM121250-02070 | BOLT | 18873- | |
| YM729350-02610 | MAIN METAL A.,NO.2 | 18873- | ||
| STANDARD | ||||
| 9 | YM729350-02800 | METAL ASS'Y,NO.2 | 18873- | |
| 9 | \6\ | METAL,MAIN | 18873- | |
| UNDERSIZE 0.25MM | ||||
| 9 | YM129350-02330 | METAL ASS'Y,NO.2 | 18873- | |
| 10 | \6\ | CAP ASS'Y | 18873- | |
| 11 | YM121250-02070 | BOLT | 18873- | |
| 12 | YM121550-02300 | BOLT,SET | 18873- | |
| YM721550-02500 | COVER ASS'Y | 18873- | ||
| 13 | \6\ | COVER | 18873- | |
| STANDARD | ||||
| 14 | YM121550-02110 | METAL,MAIN, REAR | 18873- | |
| UNDERSIZE 0.25MM | ||||
| 14 | YM121550-02320 | METAL,MAIN, REAR | 18873- | |
| 15 | YM121551-02220 | SEAL, REAR | 18873- | |
| 16 | YM24341-001350 | O-RING | 18873- | |
| 17 | YM26013-080202 | BOLT | 18873- | |
| 18 | YM129350-21200 | GEAR,CRANK | 18873- | |
| 19 | YM22351-040008 | PIN,SPRING | 18873- | |
| 20 | YM129335-21650 | PULLEY,CRANK | 18873- | |
| 21 | YM26776-180002 | NUT | 18873- |