Adler MB 250S (1955)

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The Adler MB 250S is a 1955 motorcycle with a 2 cylinder, 2 stroke engine and a capacity of 247 cc. It has a kick start and a 6V, 6Ah battery with a 6 V 45/60 W ignition set, battery and coil. The carburetor is a single Bing carburetor, and the exhaust system is twin, steel, chrome. The motorcycle has a multi-plate clutch and a 4-speed gearbox housed in the engine block with a foot gearchange. The final drive is a chain that is fully enclosed. The frame is a double tubular frame with a sidecar adapter, and the front suspension is twin swinging leading link forks with a shock absorber and steering damper. The rear suspension has plunger shock absorbers that are adjustable for load and road conditions. The tires on both the front and back are 3.25 x 16 in., and the brakes are drums with a diameter of 180 mm. The motorcycle has a compression ratio of 1:6.6 and produces a maximum power of 13.1 kW / 18 hp at 5,590 rpm. Lubrication is achieved through a petrol oil mix at a ratio of 25:1.

Technical specifications:

Make Model: Adler MB 250S

Year: 1955


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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