Yamaha YDS-1

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1959 Yamaha YDS-1

The Yamaha YDS-1 was a 250cc, 2-stroke, twin cylinder, twin carb, streetbike produced by Yamaha starting in 1959 that had a reputation for blowing away 650cc vertical twins during this time.

YDS-1

Further developing on the sporty performance of the YD-1, this new model mounted a 20hp engine on a steel-pipe cradle frame to achieve unprecedented running performance. Features like the first domestic-made 5-speed transmission and combination type instrument panel with engine tachometer caught the imagination of sports riders, who quickly nicknamed it “Japan’s first sports model.”


YDS1-R[edit]

1959 Yamaha YDS1-R

The YDS1-R was a race kitted version of Yamaha's new for 1959 street bike. These machines were Yamaha's first effort at building a European style road racer, their previous models were more dirt oriented to suit the Japanese racing scene. These machines were the forerunners of the very successful TD/TZ250 parallel twin racing machines that dominated that 250cc racing class for a number of years.

1959 Yamaha YDS-1.jpg
Yamaha YDS-1
Manufacturer
Production 1959
Class Naked
Engine
Twin cylinder, two stroke, OHV, air-cooled
Bore / Stroke 53.3mm x 53.3mm
Horsepower 17.97 HP (13.4 KW) @ 7500RPM
Torque 3.69 ft/lbs (5.0 Nm) @ 6000RPM
Transmission Gear box: 4-Speed

Final Drive: Chain

Clutch: Wet, multiplate
Suspension Front: Telescopic forks
Rear: Swing arm
Brakes Front: Drum
Rear: Drum
Front Tire 3.00-18
Rear Tire 3.00-18
Weight 138.0 kg (wet)
Recommended Oil Yamalube 10w-40
Manuals Service Manual


The Yamaha YDS-1 was a Twin cylinder, two stroke, OHV, air-cooled Naked motorcycle produced by Yamaha in 1959. Max torque was 3.69 ft/lbs (5.0 Nm) @ 6000 RPM. Claimed horsepower was 17.97 HP (13.4 KW) @ 7500 RPM.

Engine[edit]

A 53.3mm bore x 53.3mm stroke result in a displacement of just 249.0 cubic centimeters.

Drive[edit]

The bike has a 4-Speed transmission. Power was moderated via the Wet, multiplate.

Chassis[edit]

It came with a 3.00-18 front tire and a 3.00-18 rear tire. Stopping was achieved via Drum in the front and a Drum in the rear. The front suspension was a Telescopic forks while the rear was equipped with a Swing arm.

1959 - 1962 Yamaha YDS-1[edit]

1959 - 1962 Yamaha YDS-1

Further developing on the sporty performance of the YD-1, this new model mounted a 20 hp (15 Kw) engine on a steel-pipe cradle frame to achieve unprecedented running performance. Features like the first domestic-made 5-speed transmission and combination type instrument panel with engine tachometer caught the imagination of sports riders, who quickly nicknamed it Japan’s first sports model.