Adler MB 250S

   

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

Dimensions

Length  1968 mm / 77.5 in.

Width      650 mm / 25.6 in.

Height     935 mm / 36.8 in.

Wheelbase

1257 mm / 49.5 in.

Dry Weight

135 kg / 298 lbs

Wet Weight

145 kg / 320 lbs

Fuel Capacity

12 L / 3.2 US gal

Reserve

3.8 L / 1 US gal

Average Consumption

3.6 l/100 km / 27.8 km/l / 65.3 US mpg

Top Speed

125 km/h / 77 mph

Colours

Black, Metal Green, Blue

Source

Wikipedia, adler-oldtimer.de, adlermorotcycles.com, motorcycleclassics.com

The sports model of the MB 250 with raised dual exhaust, more power and deep sports handlebars.  The MB 250 S was an absolute rocket! Starting bike for many racers of private riders in on-road and off-road competitions. The engine developed then in 1956 and the motocross delivered a good 20 hp.

This bike was built for the American market, restored by Rolf Otto