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 Yamaha - 500 OW 61
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Photo ou archives : F-M. Dumas

Capacity : 500
Model : OW 61
Production : 1982 -
Category : (R) Racing


500 OW 61 / Kenny Roberts -1982

Pushing the limit

At the start of 1982, Kenny Roberts, after having taken the world championship for three years, had just been defeated by Lucchinelli, and wanted to get his title back. To achieve that, he put pressure on Yamaha to obtain a motorcycle that suited his style of riding 

The Factory Sets the Pace

Yamaha took him seriously. During the winter they developed not one, but two totally different motorcycles. If the OW 60 of Sheene, Crosby, and Fontan was an extrapolation of the OW 54 of the previous year, with its square-four engine and quadruple rotaty inlet valves, the OW 61 they developed for Kenny Roberts was completely new. It had a V4 engine with two rotary distributor valves in the angle of the V. The transverse mounting of the rear damper was a new idea; it was "nipped" between two bellcranks, which inspired the machine's nickname of "crab."

Too Much Work

Yamaha had tried to do too much. Developing two different racers was too much of a workload and Roberts passed the season in getting used to his bike, whose

road-holding was tricky, whose engine was too fierce, whose tires were unsuitable. At the end of the season, Suzuki again took the title, this time with Uncini, and Roberts was only fourth. It wasn't until 1983 that he got the bike he really wanted, the OW 70.


Engine: 498cc (60x50.6mm) water-cooled V4; twin crankshafts

Power Rating: 130 hp @ 11,500 rpm

Valves: two-stroke

Fuel System: two 34 or 36mm twin-choke carburetors

Transmission: 6-speed

Suspension: telescopic forks (front); swinging arm and spring/damper (rear)

Brakes: disk (front & rear)

Wheels: 18 inch

Weight: 266 lb

Maximum Speed: 180 mph


The OW 61 had a modest competition record but it was technically innovative in a category where the rule is evolution rather than revolution.


Le fichier Moto Passion réalisé par François-Marie Dumas réunit près de deux mille photos accompagnées d'un historique très complet des machines présentées.
Il sera progressivement mis à jour ici et toute information complémentaire est la bienvenue sur info@moto-collection.org.

Cette documentation unique, qui constitue sans doute l'encyclopédie la plus exhaustive jamais écrite sur l'histoire de la moto, a été réalisée avec l'assistance de nombreux spécialistes dont principalement Didier Ganneau, Christophe Gaime, Mick Woollett, Jean Goyard, Bernard Salvat, Christian Rey, Yves Campion, Helmut Krackowizer, Michael Dregni, Michel Montange, etc. que je remercie ici.

Disponible sur demande :
- Les fiches originales sur papier
- Les photos et archives signées de mon nom en haute définition ou les documents originaux.
Me contacter sur info@moto-collection.org pour les conditions et droits d'utilisation.