| # | Rider | Age | Bike | Team |
|---|---|---|---|---|
| 1 |  Raymond ROCHE | 34 |  Ducati 888 | Corse Ducati Lucchinelli |
| 2 |  Fabrizio PIROVANO | 31 | Yamaha OW01 | BYRD-Yamaha-CP Racing |
| 3 |  Stéphane MERTENS | 32 |  Ducati 851 | Total Wanty Stéphane Mertens Racing |
| 4 |  Rob PHILLIS | 35 | Kawasaki ZXR750 | Team Kawasaki |
| 5 |  Carl FOGARTY | 26 | Honda RC30 | Silkolene Honda Britain |
| 7 | Terry RYMER | 24 |  Yamaha OW01 | Team Loctite Yamaha |
| 8 | Baldassarre MONTI | 30 | Honda RC30 | Team Rumi |
| 9 | Giancarlo FALAPPA | 28 | Ducati 888 | Corse Ducati Lucchinelli |
| 10 |  Jari SUHONEN | 24 | Yamaha OW01 | Arwidson Yamaha Team |
| 14 | Malcolm CAMPBELL | 38 | Honda RC30 | Team Yoshiharu |
| 15 | Peter GODDARD | 27 | Yamaha OW01 | Team Hayashi |
| 17 |  Udo MARK | 27 | Yamaha OW01 | Mitsui Yamaha Racing Team |
| 19 | Rob McELNEA | 31 | Yamaha OW01 | Team Loctite Yamaha |
| 20 |  Edwin WEIBEL | 35 | Honda RC30 | Swiss MSW Team |
| 23 |  Doug POLEN | 30 | Ducati 851 | Fast by Ferracci |
| 24 |  Jeffry DE VRIES | 26 | Yamaha OW01 | Yamaha Racing Team Henk de Vries |
| 25 | Davide TARDOZZI | 32 | Ducati 888 | Grottini Divisione Corse |
| 27 | Fred MERKEL | 28 | Honda RC30 | Team Rumi |
| 28 |  Aaron SLIGHT | 25 | Kawasaki ZXR750 | Team Moving Kawasaki |
| 29 | Scott RUSSELL | 26 | Kawasaki ZXR750 | Team Moving Kawasaki |
| 30 |  Juan LÓPEZ MELLA | 26 | Honda RC30 | Nivea Honda Team |
| 32 | René DELABY | 34 | Honda RC30 | Team Wanty |
| 33 | Niall MACKENZIE | 30 | Yamaha OW01 | Team Hayashi |
| 34 | Massimo MEREGALLI | 20 | Yamaha OW01 | BYRD-Yamaha-CP Racing |
| 34 |  Kenji OSAKA | 24 | Yamaha OW01 | Team Hayashi |
| 36 | Masanao AOKI | 25 | Suzuki GSX-R750 | Yoshimura Japan |
| 37 | Koichi KOBAYASHI | 27 | Honda RC30 | Blue Helmets MSC |
| 38 | Tetsuya SHIRAI | 27 | Honda RC30 | Kouyou-kai Dream Racing Team |
| 39 | Tom KIPP | 22 | Yamaha OW01 | Over Racing |
| 41 | Ryuji TSURUTA | 25 | Kawasaki ZXR750 | Team Green |
| 42 | Keiichi KITAGAWA | 24 | Kawasaki ZXR750 | Team Green |
| 43 | Shin'ichiro OHURA | 24 |  Yamaha OW01 | NCS Over Racing |
| 44 | Kiyokazu TADA | 37 | Kawasaki ZXR750 | Tsukigi Racing |
| 45 | Kevin MAGEE | 29 | Yamaha OW01 | Y.R.T.R. |
| 46 | Hiromasa SAKAMOTO | ? | Yamaha OW01 | RSM RT Hachinohe |
| 48 | Daniel AMATRIAÍN | 23 | Honda RC30 | Team Dholda Honda |
| 49 | Hiroshi KOBAYASHI | ? | Yamaha OW01 | Team RS-Katakura |
| 50 | Roy LESLIE | 35 |  Ducati 851 | Mister Donut Racing Team |
| 51 | Bruno BONHUIL | 31 | Yamaha OW01 | Motor Team Development |
| 53 | Shingo KATO | 24 | Yamaha OW01 | Over Racing |
| 54 | Tadaaki HANAMURA | 31 | Yamaha OW01 | Team RS-Katakura |
| 64 | Adriano NARDUCCI | 35 | Ducati 851 | |
| 88 | Tohru SUZUKI | 24 | Kawasaki ZXR750 | Mister Donut Racing Team |
| 94 | Christophe GUYOT | 29 | Honda RC30 | |
| 99 | Jean-Yves MOUNIER | 30 | Yamaha OW01 | Sonauto Yamaha |
1991-08-23 to 1991-08-25
World Superbike Japanese Round
Sugo (Permanent circuit, 3.7375 km)
Attendance: 40,000
Event permit: IMN 02/9
Timekeepers: SEIKO Timing
Entries: ? / Practised: 37 / Qualified: 36
Sessions
Entry list
Struck out text denotes riders on entry list who did not participate.
Sources:
Official results/ 1991-xx-xx Screensport TV coverage/ BIKE 1991-07 pg51-53/ Cycle News pg20-21 1991-09-11/ El Mundo Deportivo 1991-08-25 pg45/ El Mundo Deportivo 1991-08-26 pg49/ Le Soir 1991-08-24 pg27/ Le Soir 1991-08-26 pg23/ Moto Revue n3004 pg15/ Riding Sport 1991 Suzuka 8 Hours Special pg93/ Riding Sport 1991-05 pg109/ Riding Sport n.104 pg68/ Riding Sport n.104 pg110-113/ Riding Sport n.105 pg26/ Riding Sport n.106 pg22-23/ Riding Sport n.106 pg154-159/ Sugo 40th anniversary website/ Yamaha Motor News 1991-06