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[[Image:1959 Yamaha YDS-1.jpg|200px|thumb|right|1959 Yamaha YDS-1]]
[[Image:1959 Yamaha YDS-1.jpg|200px|thumb|right|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.
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.
[[Image:YDS-1.jpg|thumb|350px|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==
==YDS1-R==
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[[Category:1950s motorcycles]]
[[Category:1950s motorcycles]]
[[Category:Yamaha motorcycles]]
[[Category:Yamaha motorcycles]]
{{Motorcycle
|name            = Yamaha YDS-1
|photo=1959 Yamaha YDS-1.jpg
|aka              =
|manufacturer    = Yamaha
|parent_company  =
|production      = 1959
|model_year      =
|predecessor      =
|successor        =
|class            = Naked
|engine          = Twin cylinder, two stroke, OHV, air-cooled
|bore_stroke      = 53.3mm x 53.3mm
|compression      =
|top_speed        =
|power            = 17.97 HP (13.4 KW) @ 7500RPM
|torque          = 3.69 ft/lbs (5.0 Nm) @ 6000RPM
|ignition        =
|spark_plug      =
|battery          =
|transmission    = Gear box: 4-Speed <br>
Final Drive: Chain <br>
Clutch: Wet, multiplate <br>
|frame            =
|suspension      =Front: Telescopic forks <br>
Rear: Swing arm
|brakes          =Front: Drum <br>Rear: Drum
|front_tire      = {{tire|3.00-18}}
|rear_tire    = {{tire|3.00-18}}
|rake_trail      =
|wheelbase        =
|length          =
|width            =
|height          =
|seat_height      =
|dry_weight      =
|wet_weight      = 138.0 kg
|fuel_capacity    =
|oil_capacity    =
|recommended_oil=Yamalube 10w-40
|fuel_consumption =
|turning_radius  =
|related          =
|competition      =
}}
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==
A 53.3mm [[bore]] x 53.3mm [[stroke]] result in a [[displacement]] of just 249.0 cubic centimeters. 
==Drive==
The bike has a 4-Speed transmission. Power was moderated via the Wet, multiplate. 
==Chassis==
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==
[[File:yamaha-yds-1-2-1959-1962-0.jpg|600px|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.
[[Category:Naked motorcycles]]
[[Category:Yamaha motorcycles]]
[[Category:1950s motorcycles]]

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