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 Yamaha - Y DS 3
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Yamaha D2-492-12-15
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.

Motorcycle encyclopedia Moto Passion, realised by François-Marie Dumas, include almost 2000 photos presented with an exhaustive history of the motorcycles exhibited.

This unique collection has been realised with the participation of many specialists. With many thanks in particular to Yves Campion, Michael Dregni, Didier Ganneau, Jean Goyard, Helmut Krackowizer, Michel Montange, Christian Rey, Bernard Salvat, Mick Woollett, etc

One can order here

  • Original cards on paper (in french)
  • High resolution scans or original documents presented and signed with my name.

Please contact me at info@moto-collection.org for conditions and copyright.

© Tous droits réservés
François-Marie Dumas

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