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Yamaha YDS-1

Make Model	Yamaha YDS-1
Year	1959-61
Engine	Two stroke, piston-port, parallel twin
Capacity	247 cc / 15.0 cu-in
Bore x Stroke	54 x 54 mm
Cooling System	Air-cooled
Compression Ratio
Induction	Single carburetor
Starting	Kick
Max Power	18 hp @ 7500 rpm
Max Torque	5.2 kgf-m @ 6000 rpm
Transmission	5 Speed
Final Drive	Chain
Front Suspension	Telescopic forks
Rear Suspension	Swing arm
Front Brakes	Drum
Rear Brakes	Drum
Front Tyre	3.00 -18
Rear Tyre	3.00 -18
Wet Weight	138 kg / 309 lbs
Fuel Capacity

The YDS-1 mounts a tuned-up version of the YD-1 motor in a double-cradle frame (the earlier version was built on a pressed-steel spine). The YDS-1 establishes the pattern for the next 20 years of sporty Yamaha two-stroke Twins.