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240 Landmarks of Japanese Automotive Technology
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240 Landmarks TopMotorcycles > Yamaha Sports YDS-3
 Yamaha Sports YDS-3
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This model used the world’s first oil injection lubrication system (the Yamaha Autolube system) in a 2-stroke engine that traditionally employed blended-oil lubrication.
One of the design elements was the side cover holding the oil tank.
The rear suspension was equipped with a 3-step adjustable shock absorber.
The Yamaha Autolube system employed a plunger pump as a method for allowing minute amounts of oil to spread over the lubricated surfaces of each engine part. The structure utilized a distributor that reliably discharged oil at each stroke.
In order to inject an amount of oil corresponding to the engine load, a mechanism was incorporated for varying the plunger stroke in conjunction with the throttle angle.
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Storage location:YAMAHA COMMUNICATION PLAZA (2500, Shingai, Iwata-shi, Shizuoka-ken 438-8501)
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Year manufactured:1964
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Manufacturer:Yamaha Motor Co., Ltd.
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Classification:Mass-production vehicle
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Current status:On public display: static
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Vehicle name / Manufacture
Vehicle name:Yamaha Sports YDS-3
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Model:Yamaha Y23(YDS-3)
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Company name:Yamaha Motor Co., Ltd.
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Vehicle type/usage:On-road sports bike
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Location of actual vehicle/replica:Communication Plaza
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Year manufactured:1964
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Designed by:Yamaha Motor Co., Ltd.
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Model / Weight
Style:Sports
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Passenger capacity:2
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Weight:163 kg
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Front axle weight:73 kg
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Rear axle weight:90 kg
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Points of interest, topicality:Vehicle with 2-stroke separate lubrication pump
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Body / Size
Overall length:1975 mm
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Overall width:780 mm
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Overall height:1050 mm
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Headlamp type:6 V, 35 W
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Tire size (front):3.00-18-2PR
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Tire size (rear):3.00-18-4PR
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Body / Axle / Driving / Others
Frame:Double cradle
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Suspension type (front):Telescopic fork
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Suspension type (rear):Swing arm
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Wheelbase:1295 mm
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Brakes (front):Wire internal expanding brake
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Brakes (rear):Wire internal expanding brake
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Damper (front):Coil spring, oil damper
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Damper (rear):Coil spring, oil damper
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Engine/ Size / Power
Type:Air-cooled 2-stroke gasoline
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Cylinder arrangement:Inline 2-cylinder
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Carburetor:VM245CX2
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Bore x stroke:56×50
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Displacement:246 cc
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Ignition system:Battery ignition
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Max. power/r.p.m.:23 ps/7500 rpm
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Lubrication method:Separate lubrication
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Start method:Kick
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Fuel tank capacity:14 L
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Drive-train
Transmission:Constant-mesh type 5 forward speeds
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Clutch type:Wet multiple disc type
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Performance
Fuel economy rating:40 km/L (at 40 km/h)
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