| # | Rider | Age | Bike | Team |
|---|---|---|---|---|
| 1 |  Fred MERKEL | 27 |  Honda RC30 | Team Rumi/RCM |
| 2 |  Stéphane MERTENS | 31 |  Honda RC30 | Total/Bel-Ray |
| 3 |  Raymond ROCHE | 33 | Ducati 851 | Squadra Corse Ducati Lucchinelli |
| 4 |  Fabrizio PIROVANO | 30 | Yamaha OW01 | Pirovano-STO Racing Team |
| 5 |  Anders ANDERSSON | 32 | Yamaha OW01 | Team Yamaha Sweden |
| 6 | Giancarlo FALAPPA | 27 | Ducati 851 | Squadra Corse Ducati Lucchinelli |
| 7 |  Terry RYMER | 23 |  Yamaha OW01 | Team Loctite Yamaha |
| 8 | Baldassarre MONTI | 29 | Honda RC30 | Team Rumi/RCM |
| 9 |  Jari SUHONEN | 23 | Yamaha OW01 | Arwidson Yamaha Team |
| 11 |  Rob PHILLIS | 34 | Kawasaki ZXR750 | Team Shin-Etsu Kawasaki |
| 16 | Malcolm CAMPBELL | 37 | Honda RC30 | Moriwaki Engineering Ltd. |
| 19 | Rob McELNEA | 30 | Yamaha OW01 | Team Loctite Yamaha |
| 21 | Doug POLEN | 29 | Suzuki GSX-R750 | Yoshimura Suzuki Sietto GP-1 |
| 23 |  Ernst GSCHWENDER | 34 | Honda RC30 | Eagle Racing Team |
| 30 | Brian MORRISON | 29 | Honda RC30 | Cheerio & Team Yoshiharu |
| 32 |  Kit Choong CHAO | 28 | Kawasaki ZXR750 | Team Lucky Strike Kawasaki |
| 33 | Simon BUCKMASTER | 29 | Honda RC30 | Gomibuchi Shoei & Garage Shonan |
| 34 | René DELABY | 33 | Honda RC30 | Team Wanty |
| 37 | Peter GODDARD | 26 | Yamaha OW01 | Italiya Yamaha Team Hayashi |
| 38 | Tom KIPP | 21 | Yamaha OW01 | |
| 42 | Jamie JAMES | 29 | Ducati 851 | Squadra Corse Ducati Lucchinelli |
| 43 | Udo MARK | 26 | Yamaha OW01 | Mitsui Yamaha Racing Team |
| 44 |  Saen CHOEISAK | ? |  Yamaha OW01 | Team Yamaha IRC Thailand |
| 45 | Doug CHANDLER | 24 | Kawasaki ZXR750 | Team Moving Kawasaki |
| 46 |  Christian ZWEDORN | 24 | Honda RC30 | Eagle Racing Team |
| 51 |  Toshiharu KANEKO | ? | Yamaha OW01 | Team RS-Katakura |
| 52 | Tadaaki HANAMURA | 30 | Yamaha OW01 | Team RS-Katakura |
| 53 | Masaru SHOYAMA | ? | Honda RC30 | Kouyou-kai Dream Racing Team |
| 54 | Kenji OSAKA | 23 | Yamaha OW01 | Italiya Yamaha Team Hayashi |
| 56 | Mitsuo SAITO | 32 | Yamaha OW01 | Team Kanaya & Clever Wolf Racing Team |
| 57 | Gakushin SATO | ? | Honda RC30 | Team A'-Technora |
| 59 | Tetsuya SHIRAI | 26 | Honda RC30 | Kouyou-kai Dream Racing Team |
| 60 | Koichi KOBAYASHI | 26 | Honda RC30 | Blue Helmets MSC |
| 61 | Shigemasa MIWA | 28 | Honda RC30 | Blue Helmets MSC |
| 65 | Shingo KATO | 23 | Yamaha OW01 | Over Racing |
| 66 | Masanao AOKI | 24 | Yamaha OW01 | Kiss Racing Team |
| 67 | Toshiya KOBAYASHI | 23 | Honda RC30 | Technical Sports |
| 69 | Kosei YAMAMOTO | 27 | Honda RC30 | Fast Racing Team |
| Ken'ichiro IWAHASHI | 25 | Honda RC30 | BVD Yamamoto Racing |
1990-08-24 to 1990-08-26
World Superbike Japanese Round
Sugo (Permanent circuit, 3.7375 km)
Attendance: 40,000
Event permit: IMN 02/9
Timekeepers: SEIKO Timing
Entries: ? / Practised: 36 / Qualified: 36
Sessions
Entry list
Struck out text denotes riders on entry list who did not participate.
Sources:
Official results/ 1990-09-15 Sendai Television delayed coverage/ Cycle News 1990-09-12 pg20-21/ Motosprint 1990-35 pg50-53/ Riding Sport n92 pg108-112/ Riding Sport n94 pg106-107/ Riding Sport n94 pg168-175/ Sugo 40th anniversary website/ Superbike 1991