Yamaha DX250

Make Model	Yamaha DX 250
Year	1970
Engine	Two stroke, single cylinder
Capacity	247 cc / 15.0 cu-in
Bore x Stroke	54 х 54 mm
Cooling System	Air cooled
Compression Ratio	6.7:1
Induction	Carburetor
Ignition	Flywheel magneto
Starting	Kick
Max power	30 hp / 22 kW @ 7200 rpm
Max Torque	28.6 Nm / 2.92kgf-m @ 7000 rpm
Transmission	6 Speed
Final Drive	Chain
Front Suspension	Telescopic forks
Rear Suspension	Dual shocks
Front Brakes	Drum
Rear Brakes	Drum
Front Tyre	3.00-18
Rear Tyre	3.50-18
Dry Weight	138 kg / 304.2 lbs
Fuel Capacity

This model was the 250cc version of the sport model RX350 released in April of the same year. Its newly designed 2-cylinder engine featured a 5-port layout, "Autolube" oil supply system and twin carburetors, and was mounted on a double cradle type frame made of high-tensile steel as on Yamaha's production racers. The un-sprung components included a Ceriani type front fork with an aluminum bottom case, a 3-way adjustable rear cushioning unit and completely dust- and water-proof drum brakes. It achieved light and agile handling that set a new standard for sport bikes of the time.