Incoming
| Rider | Team 2003 |
|---|---|
 | |
| |
| |
|
Outgoing
| Rider | Team 2004 |
|---|---|
| Ken Hashikawa | Retired |
| Takashi Miyazawa | Retired |
| Masakazu Mori | Retired |
| Tichi Suzuki | Retired |
| Masashi Takemoto | Retired |
| Rider | Team 2003 |
|---|---|
| |
| |
| |
|
| Rider | Team 2004 |
|---|---|
| Ken Hashikawa | Retired |
| Takashi Miyazawa | Retired |
| Masakazu Mori | Retired |
| Tichi Suzuki | Retired |
| Masashi Takemoto | Retired |