125cc Grand Prix leading entries for 1990:
| no. | rider | entrant | bike |
| 2 | Hans Spaan NED | Sharp-Samson Racing Team | Honda RS |
| 3 | Ezio Gianola ITA* | Nacional Moto SA - Derbi | Derbi |
| 38 | Luis I Alvaro ESP* | Nacional Moto SA - Derbi | Derbi |
| 4 | Hisashi Unemoto JAP | Team Unemoto | Honda RS |
| 5 | Fausto Gresini ITA | AGV Pileri Corse | Honda RS |
| 65 | Loris Capirossi ITA# | AGV Pileri Corse | Honda RS |
| 6 | Koji Takada JAP* | Team Takeshima | Honda RS |
| 68 | Kinya Wada JAP*# | Team Takeshima | Honda RS |
| 7 | Stefan Prein BRD | Lanson Honda Racing | Honda RS |
| 8 | Julián Miralles ESP | Coronas Racing Team | JJ Cobas |
| 10 | Allan Scott USA# | Allan Scott Racing | Honda RS |
| 10 | Allan Scott USA# | Garelli | Garelli |
| 14 | Luis Miguel Reyes ESP* | Garelli | Garelli |
| 11 | Adolf Stadler BRD | RS Rallye Sport Racing Team | Cobas-Rotax |
| 24 | Peter Öttl BRD | RS Rallye Sport Racing Team | Cobas-Rotax |
| 12 | Robin Milton ENG | Robin Milton | Honda RS |
| 16 | Dirk Raudies BRD | AMC Biberach/Riss e.V im ADAC | Honda RS |
| 17 | Alfred Waibel BRD | Gerstmann Racing | Honda RS |
| 18 | Taru Rinne FIN | Team Rumi | Honda RS |
| 20 | Doriano Romboni ITA | Moto Club Crostolo | Honda RS |
| 21 | Stefan Dörflinger SUI | Marlboro Aprilia Team Dörflinger | Aprilia-Cobas |
| 22 | Manuel Herreros ESP | Cepsa | JJ Cobas TB |
| 23 | Bruno Casanova ITA | Semprucci/Club del Motore-Forli | Honda RS |
| 25 | Herri Torrontégui ESP | Repsol Honda | Honda RS |
| 29 | Antonio Sánchez ESP | Antonio Sánchez Ballesteros | JJ Cobas |
| 30 | Hans Koopman NED | Viplex Plastics Holland | Honda RS |
| 31 | Ralf Waldmann BRD | Schuh Racing Team | Cobas-Rotax |
| 32 | José Saez ESP | José Saez Calabuig | Honda |
| 33 | Jaime Mariano ESP | Timspeed Casal | various |
| 34 | Jos van Dongen NED | Ringelberg Team | Honda |
| 36 | Stefan Kurfiss BRD | Stefan Kurfiss | Honda RS |
| 37 | Gabriele Debbia ITA | Team Italia | Aprilia |
| 39 | Alessandro Gramigni ITA | Team Italia | Aprilia |
| 40 | Peter Galvin AUS | Team Driza Bone | Honda |
| 42 | Flemming Kistrup DAN | Thomas Moller Pedersen | Honda RS |
| 43 | Robin Appleyard ENG# | Colin Appleyard Ltd | Honda RS |
| 45 | Thierry Feuz SUI | BP Racing Team Switzerland | Honda RS |
| 46 | Johnny Wickström FIN | Silja Line | Honda/Cobas |
| 49 | Hervé Duffard FRA# | Hervé Duffard | Honda |
| 50 | Steve Patrickson ENG# | Derek Clarke Racing Team | Honda RS |
| 51 | Stuart Edwards ENG# | Stuart Edwards | Honda RS |
| 52 | Maurizio Vitali ITA# | Gazzaniga Corse | Gazzaniga-R’t’x |
| 53 | Stefan Brägger SUI# | Mori Sport Laverda | various |
| 54 | Heinz Lüthi SUI# | Team Lucky Strike Elf | Honda RS |
| 55 | Jorge Martínez ESP | Ducados JJ Cobas | JJ Cobas-Rotax |
| 56 | Bady Hassaine TUN# | Digitec | Honda RS |
| 57 | Manuel Hernández ESP# | Team Honda Liqor 43 | Honda RS |
| 60 | Mike Leitner AUT# | EMCO Sports Team | Honda |
| 61 | Hubert Abold BRD# | Hubert Abold | Honda |
| 61 | Emilio Cuppini ITA | T. C. Winchester Racing Team | Honda RS |
| 66 | Emilio Cuppini ITA | Moto Club Biccirelli | Honda RS |
* did not race full season
# Capirossi also raced numbers 48, 67, 75, 47 and 59
# Wada also raced number 67
# Scott also raced number 9 ?
# Appleyard also raced number 47
# Duffard also raced number 62
# Patrickson also raced numbers 54 and 63
# Edwards also raced numbers 52 and 64
# Vitali also raced numbers 51 and 59
# Brägger also raced number 57
# Lüthi also raced numbers 64 and 66
# Hassaine also raced numbers 65 and 49
# Hernández also raced numbers 63, 43 and 55
# Leitner also raced number 48
# Abold also raced number 53
With grateful thanks to Phil Wain of RealRoadRacing.com
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