# 1991 Italian motorcycle Grand Prix

The 1991 Italian motorcycle Grand Prix was the fifth race of the 1991 Grand Prix motorcycle racing season. It took place on the weekend of 17–19 May 1991 at the Circuito Internazionale Santa Monica.

## 500 cc classification

| Pos. | Rider | Team | Manufacturer | Laps | Time | Grid | Points |
| 1 | Michael Doohan | Rothmans Honda Team | Honda | 36 | 46:27.037 | 5 | 20 |
| 2 | John Kocinski | Marlboro Team Roberts | Yamaha | 36 | +8.677 | 2 | 17 |
| 3 | Eddie Lawson | Cagiva Corse | Cagiva | 36 | +14.319 | 4 | 15 |
| 4 | Alex Barros | Cagiva Corse | Cagiva | 36 | +23.151 | 7 | 13 |
| 5 | Jean-Philippe Ruggia | Sonauto Yamaha Mobil 1 | Yamaha | 36 | +23.561 | 8 | 11 |
| 6 | Doug Chandler | Roberts B Team | Yamaha | 36 | +28.135 | 6 | 10 |
| 7 | Kevin Schwantz | Lucky Strike Suzuki | Suzuki | 36 | +28.480 | 3 | 9 |
| 8 | Juan Garriga | Ducados Yamaha | Yamaha | 36 | +48.073 | 10 | 8 |
| 9 | Wayne Rainey | Marlboro Team Roberts | Yamaha | 36 | +1:11.518 | 1 | 7 |
| 10 | Eddie Laycock | Millar Racing | Yamaha | 35 | +1 lap | 12 | 6 |
| 11 | Marco Papa | Team Marco Papa | Honda | 35 | +1 lap | 14 | 5 |
| 12 | Cees Doorakkers | HEK-Baumachines | Honda | 34 | +2 laps | 15 | 4 |
| 13 | Romolo Balbi | | Honda | 34 | +2 laps | 13 | 3 |
| 14 | Simon Buckmaster | Padgett's Racing Team | Suzuki | 33 | +3 laps | | 2 |
| 15 | Michael Rudroff | Rallye Sport | Honda | 33 | +3 laps | | 1 |
| Ret | Didier de Radiguès | Lucky Strike Suzuki | Suzuki | 29 | Retired | 9 | |
| Ret | Adrien Morillas | Sonauto Yamaha Mobil 1 | Yamaha | 29 | Retired | 11 | |
| Ret | Hans Becker | Team Romero Racing | Yamaha | 25 | Retired | | |
| Ret | Nicolas Schmassman | Schmassman Technotron | Honda | 9 | Retired | | |
| DNQ | Helmut Schutz | Rallye Sport | Honda | | Did not qualify | | |
| DNQ | Andreas Leuthe | Librenti Corse | Honda | | Did not qualify | | |
| DNQ | Larry Vacondio | | Honda | | Did not qualify | | |

## 250 cc classification

| Pos | Rider | Manufacturer | Laps | Time | Grid | Points |
| 1 | Luca Cadalora | Honda | 30 | 39:29.951 | 2 | 20 |
| 2 | Helmut Bradl | Honda | 30 | +0.009 | 1 | 17 |
| 3 | Pierfrancesco Chili | Aprilia | 30 | +8.179 | 3 | 15 |
| 4 | Loris Reggiani | Aprilia | 30 | +8.186 | 5 | 13 |
| 5 | Wilco Zeelenberg | Honda | 30 | +14.795 | 7 | 11 |
| 6 | Carlos Cardús | Honda | 30 | +14.983 | 4 | 10 |
| 7 | Masahiro Shimizu | Honda | 30 | +33.909 | 8 | 9 |
| 8 | Jochen Schmid | Honda | 30 | +52.658 | 11 | 8 |
| 9 | Andreas Preining | Aprilia | 30 | +53.825 | 14 | 7 |
| 10 | Paolo Casoli | Yamaha | 30 | +1:03.005 | 13 | 6 |
| 11 | Jean-Pierre Jeandat | Honda | 30 | +1:04.911 | | 5 |
| 12 | Erkka Korpiaho | Aprilia | 30 | +1:09.379 | | 4 |
| 13 | Renzo Colleoni | Aprilia | 30 | +1:09.886 | | 3 |
| 14 | Carlos Lavado | Yamaha | 30 | +1:17.145 | 12 | 2 |
| 15 | Stefan Prein | Honda | 29 | +1 lap | | 1 |
| 16 | Harald Eckl | Aprilia | 29 | +1 lap | | |
| 17 | Jaime Mariano | Aprilia | 29 | +1 lap | | |
| 18 | Urs Jucker | Yamaha | 29 | +1 lap | | |
| 19 | Martin Wimmer | Suzuki | 29 | +1 lap | 10 | |
| 20 | Renato Colleoni | Aprilia | 29 | +1 lap | | |
| 21 | Patrick van der Goorbergh | Yamaha | 29 | +1 lap | | |
| 22 | Bernd Kassner | Honda | 29 | +1 lap | | |
| 23 | Wayne Doran | Aprilia | 29 | +1 lap | | |
| 24 | Jean Foray | Yamaha | 29 | +1 lap | | |
| Ret | Corrado Catalano | Honda | 26 | Retired | | |
| Ret | Stefano Pennese | Aprilia | 22 | Retired | | |
| Ret | Frédéric Protat | Aprilia | 19 | Retired | | |
| Ret | Doriano Romboni | Honda | 18 | Retired | 6 | |
| Ret | Fausto Ricci | Yamaha | 18 | Retired | | |
| Ret | Àlex Crivillé | JJ Cobas | 15 | Retired | 9 | |
| Ret | Bernard Hänggeli | Aprilia | 15 | Retired | 15 | |
| Ret | Alberto Puig | Yamaha | 13 | Retired | | |
| Ret | Marcellino Lucchi | Aprilia | 13 | Retired | | |
| Ret | Ian Newton | Yamaha | 8 | Retired | | |
| Ret | Leon van der Heyden | Honda | 1 | Retired | | |

## 125 cc classification

| Pos | Rider | Manufacturer | Laps | Time | Grid | Points |
| 1 | Fausto Gresini | Honda | 26 | 36:29.927 | 1 | 20 |
| 2 | Loris Capirossi | Honda | 26 | +18.493 | 2 | 17 |
| 3 | Alessandro Gramigni | Aprilia | 26 | +23.101 | 7 | 15 |
| 4 | Ezio Gianola | Derbi | 26 | +29.088 | 4 | 13 |
| 5 | Hans Spaan | Honda | 26 | +33.230 | 10 | 11 |
| 6 | Nobuyuki Wakai | Honda | 26 | +33.629 | 13 | 10 |
| 7 | Heinz Lüthi | Honda | 26 | +34.115 | 3 | 9 |
| 8 | Gabriele Debbia | Aprilia | 26 | +34.237 | 8 | 8 |
| 9 | Ralf Waldmann | Honda | 26 | +34.460 | 11 | 7 |
| 10 | Dirk Raudies | Honda | 26 | +35.230 | | 6 |
| 11 | Ian McConnachie | Honda | 26 | +42.905 | | 5 |
| 12 | Adolf Stadler | JJ Cobas | 26 | +47.525 | 15 | 4 |
| 13 | Hisashi Unemoto | Honda | 26 | +54.431 | | 3 |
| 14 | Steve Patrickson | Honda | 26 | +1:00.339 | | 2 |
| 15 | Johnny Wickström | Honda | 26 | +1:00.539 | | 1 |
| 16 | Koji Takada | Honda | 26 | +1:06.139 | | |
| 17 | Julián Miralles | JJ Cobas | 26 | +1:06.935 | | |
| 18 | Serafino Foti | Honda | 26 | +1:07.493 | | |
| 19 | Manuel Hernández | Honda | 26 | +1:08.123 | | |
| 20 | Arie Molenaar | Honda | 26 | +1:08.427 | | |
| 21 | Alain Bronec | Honda | 26 | +1:15.924 | | |
| 22 | Thierry Feuz | Honda | 26 | +1:19.698 | | |
| 23 | Francisco Debon | JJ Cobas | 26 | +1:19.849 | | |
| 24 | Maurizio Vitali | Gazzaniga | 25 | +1 lap | 12 | |
| 25 | Luis Alvaro | Derbi | 25 | +1 lap | | |
| Ret | Kinya Wada | Honda | 25 | Retired | | |
| Ret | Bruno Casanova | Honda | 18 | Retired | 6 | |
| Ret | Peter Öttl | Rotax | 17 | Retired | | |
| Ret | Herri Torrontegui | JJ Cobas | 15 | Retired | 14 | |
| Ret | Jorge Martínez | JJ Cobas | 10 | Retired | 9 | |
| Ret | Noboru Ueda | Honda | 8 | Retired | 5 | |
| Ret | Kazuto Sakata | Honda | 5 | Retired | | |
| Ret | Manuel Herreros | JJ Cobas | 4 | Retired | | |
| Ret | Alfred Waibel | Honda | 4 | Retired | | |
| Ret | Gimmi Bosio | Honda | 0 | Retired | | |
| Ret | Emilio Cuppini | Gazzaniga | 0 | Retired | | |
| DNQ | Jos van Dongen | Honda | | | | |
| DNQ | Alan Patterson | Honda | | | | |
| DNQ | Stefan Kurfiss | Honda | | | | |
| DNQ | Stefan Bragger | Honda | | | | |
| DNQ | Hans Koopman | Honda | | | | |
| DNQ | Robin Appleyard | Honda | | | | |
| DNQ | Peter Galvin | Honda | | | | |
| DNQ | Wolfgang Fritz | Honda | | | | |
| DNQ | René Dünki | Honda | | | | |
| DNQ | Hubert Abold | Honda | | | | |
| DNQ | Janez Pintar | Honda | | | | |
| DNQ | Taru Rinne | Honda | | | | |

## Sidecar classification

| Pos | Rider | Passenger | Manufacturer | Laps | Time/Retired | Grid | Points |
| 1 | Steve Webster | Gavin Simmons | Krauser | 26 | 35:08.085 | 2 | 20 |
| 2 | Egbert Streuer | Peter Essaff | LCR-Yamaha | 26 | +14.440 | 5 | 17 |
| 3 | Paul Güdel | Charly Güdel | LCR-Krauser | 26 | +26.431 | 13 | 15 |
| 4 | Darren Dixon | Sean Dixon | LCR-Krauser | 26 | +30.300 | 10 | 13 |
| 5 | Yoshisada Kumagaya | Bryan Houghton | Krauser | 26 | +45.188 | 9 | 11 |
| 6 | Barry Brindley | Grahame Rose | LCR-Yamaha | 26 | +50.688 | 14 | 10 |
| 7 | Masato Kumano | Eckhart Rösinger | LCR-Yamaha | 26 | +50.943 | 8 | 9 |
| 8 | Ralph Bohnhorst | Bruno Hiller | Bohnhorst | 26 | +57.003 | 7 | 8 |
| 9 | Alfred Zurbrügg | Martin Zurbrügg | LCR-Yamaha | 26 | +1:08.810 | 6 | 7 |
| 10 | Theo van Kempen | Jan Kuyt | LCR-Krauser | 25 | +1 lap | | 6 |
| 11 | René Progin | Gary Irlam | LCR | 25 | +1 lap | | 5 |
| 12 | Tony Wyssen | Geral de Haas | LCR | 25 | +1 lap | | 4 |
| 13 | Tony Baker | Simon Prior | LCR-Krauser | 25 | +1 lap | | 3 |
| 14 | Markus Bösiger | Peter Markwalder | ADM | 25 | +1 lap | | 2 |
| 15 | Klaus Klaffenböck | Christian Parzer | LCR | 24 | +2 laps | 11 | 1 |
| 16 | Markus Egloff | Urs Egloff | Yamaha | 24 | +2 laps | 4 | |
| Ret | Steve Abbott | Shaun Smith | LCR-Krauser | 22 | Retired | 12 | |
| Ret | Alain Michel | Simon Birchall | Krauser | 12 | Retired | 3 | |
| Ret | Rolf Biland | Kurt Waltisperg | LCR-ADM | 3 | Retired | 1 | |
| Ret | Barry Smith | David Smith | Windle-ADM | 2 | Retired | 15 | |
| DNQ | Derek Brindley | Nick Roche | LCR | | | | |
| DNQ | Kenny Howles | C. Mugnari | Krauser | | | | |
| DNQ | Hans Hügli | Adolf Hänni | LCR | | | | |
| DNQ | Gary Thomas | Michel van Puyvelde | Krauser | | | | |
| DNQ | Reiner Kosta | Jurg Egli | Yamaha | | | | |
| DNQ | Frank Voigt | Holger Voigt | Schuh-Spezial | | | | |
| DNQ | Werner Kraus | Thomas Schröder | ADM | | | | |