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.
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 | edit source]
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.
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| 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 |
| 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 | edit source]
A 53.3mm bore x 53.3mm stroke result in a displacement of just 249.0 cubic centimeters.
Drive[edit | edit source]
The bike has a 4-Speed transmission. Power was moderated via the Wet, multiplate.
Chassis[edit | edit source]
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 | edit source]
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.