Adler ISDT (1957)

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The Adler ISDT motorcycle was manufactured in 1957 and had a 247cc, 2-cylinder, 2-stroke engine with a bore and stroke of 54 x 54mm. It was air-cooled and used a petrol oil mix of 25:1 for lubrication. The clutch was a multi-plate design and it had a kick start with a 6V, 6Ah battery. The ignition was a 6V 45/60 W ignition set, battery, and coil, and it used a single Bing carburetor with a twin steel chrome exhaust system. The maximum power output was 13.1 kW / 18 hp at 5590 rpm with a compression ratio of 1:6.6. The transmission was a 4-speed gearbox housed in the engine block, with a fully enclosed chain as the final drive. The frame was a double tubular design with a sidecar adapter, and the front suspension used twin swinging leading link forks with a shock absorber and steering damper. The rear suspension had plunger shock absorbers that were adjustable for load and road conditions. The front and rear tires were 3.25 x 16 inches, and the brakes were drums with a diameter of 180mm.

Technical specifications:

Make Model: Adler ISDT

Year: 1957


Engine: 2 cylinder, 2 stroke, flat-crowned pistons
Capacity: 247 cc / 15.1 cub in.
Bore x Stroke: 54 x 54 mm
Cooling: Air cooled
Lubrication: Petrol oil mix 25:1
Clutch: Multi plate
Starting: Kick start
Battery: 6V, 6Ah
Ignition: 6 V 45/60 W ignition set, battery and coil
Carburetor: Single Bing carburetor
Exhaust System: Twin, steel, chrome
Max Power: 13.1 kW / 18 hp @ 5590 rpm
Compression Ratio: 1: 6.6
Clutch: Multi disc in oil bath
Transmission: 4 Speed gearbox housed in engine block, foot gearchange

Final Drive: Chain, fully enclosed
Frame: Double tubular frame with sidecar adapter.
Front suspension: Twin swinging leading link forks with shock absorber and steering damper
Rear suspension: Plunger shock absorbers, adjustable for load and road conditions
Tyres (front and back): 3.25 x 16 in.
Brakes (front and back): Drums, 180 mm diameter

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