A 250cc air-cooled twin two-stroke design includes a 12v battery ignition and a five-speed transmission.

Making nearly 30 hp (22 kW) @ 7,500 r/min, the published top speed was 93 mph, with a 1/4 14.8 second quarter mile time.

Two Mikuni VM26 round slide carburetors serve the air-fuel charge.

The DS7 engine bore and stroke is 54 × 54 mm with cast iron lined aluminum cylinders.

The DS7 includes oil injection, directly into the intake port.