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 Yamaha - 250 Y DS 3
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Photo ou archives : F-M. Dumas

Capacity : 250
Model : Y DS 3
Production : 1964 - 1966
Category : (R) Street Bike


250 YDS 3-1964

Building on the first twin

It all began in 1957 with the YD 1, Yamaha's first 250 twin which, as it was steadily

developed, allowed the Hamamatsu company - which had started in 1887 as a maker of reed-organs - to dominate the market for medium-displacement sports twostrokes.

Two Big Selling Points

In 1964, Yamaha launched a new version of their successful 250, the DS 3, which came on the scene with two unique selling points: firstly, that very year Phil Read had won Yamaha's first 250cc world championship riding a twin-cylinder bike closely related to the production model, while the new Autolube lubrication system eliminated the tiresome need for two-stroke riders to mix oil with their gasoline.

The Autolube

The Autolube was a mechanical pump whose output varied with the throttle opening. It was a fairly basic system that just ensured that the oil was injected in the light proportions without - as Suzuki would do later - ensuring that oil was fed under pressure to critical points. The engine of the DS 3, still with a horizontally divided crankcase like its distant ancestor the Adler, was a distinct improvement on the DS 2, launched in 1962, gaining a third crankshaft main bearing. On its introduction in 1964 it developed 24 hp @7500 rpm, and by the final version in 1967, power output had risen to 28 hp@ 8000 rpm. As for its performance, it was outstanding for its clay. The claimed maximum speed was 90 mph in 1964 and over 96 mph in 1967.


Engine: 246cc (56x 50mm) air-cooled twincylinder

Power Rating: 24 hp @ 7500 rpm

Valves: two-stroke

Fuel System: two carburetors

Transmission: 5-speed; chain final drive

Suspension: telescopic fork (front); swinging fork with two spring/dampers (rear)

Brakes: twin leading shoe dmm (front); drum (rear)

Wheels: 18 inch

Weight: 350 lb

Maximum Speed: 90 mph

Typical of its day, the dial in the headlamp shell incorporales speedometer and tachometer.

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.