Adler ISDT (1957)

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.

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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