Adler Information

Manufacturer: Adlerwerke (Heinrich Kleyer AG), Frankfurt am Main
ADLER - M250/Steib LS200 Frame-No. 202091

Engine:  Air cooled two-cylinder Adler two-stroke engine with flat-crowned pistons, drilling 54 mm, piston stroke 54 mm, cubic capacity 247 ccm, compression 1:5,75.  Normal rating of 16 PS at 5590 rpm, one slide carburettor built-in in the engine housing.  Electrical Equipment:  Voltage controlled 6 Volt 45/60 W, lighting and ingnition set, battery  6 V, 6 Ah.  Gearbox and drive:  Adler four-Speed Gerabox in the engine block, ratchet foot gear change,, multiple-disc clutch, elastic drive transmission by fully encapsulated roll chain. Chassis:  Double tubular brazed frame with great lateral rigidity with sidecar adapter. Front fork: Separate fork bars with swinging arm resilience, encapsulated friction shock absorber; telescope rear wheel resilience with oleograph shock absorbers,  working progressively. Full telling axises. Tyres:   3.25 x 16

Brakes:  Drum brakes 180 mm í. Fuel tank:  Contents of approx. 12 ltr rubber mounted, with rubber knee grips and tool container.  Fuel consumption:  3,6 ltr. (5,7 ltr.)/100 km. Maximum speed: 116,5 / (95,0) km/h (full throttle). km/std. (autobahnfest). Gross weight: 135 kg/(200 kg with LS200 sidecar) Equipment: Deep-drawn mudguards, rear mudguard hinged, carrier, center stand, adjustable foot rests, adjustable handlebar, thief-proof lock in stearing head, speedometer and kilometercounter built-in in the headlight and illuminated. Electrical horn, back light and break stop light. Accessory: Handycapped-tank-gearshift  with guide tube and shift stem.  Additional shock absorbers for front fork. Price: DM 1.985,-- Sport-Edition with upper mounted Exhaustpipes: DM 2.091,50.

Below is a collection of symbols used by Adler through the ages.

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This interesting article was sent in by Scott Keifer from the USA. A water cooled 115MPH Adler. Click on the images to enlarge.

Original Adler Brochure

Copy of Adler advert in the 1956 edition of Cycle Magazine

The Eagle Soars Again

Adler Test . Go to Brendan Farrelly`s site .

Heinz Odoerfer of Nuernberg Germany has answered the question about the Adler photograph on the Photo page of the web site .
He built this motorcycle in 1970 and registered it in 1973 .
The design was based on the factory Yamaha model from 1963-1965 which won the 250ccm world championships in 1964 & 1965 .
At that time the Yamaha was the fastest racing bike in the world up to 500 ccm .

The Odoerfer Adler has a 305 ccm motor producing approx 35 hp at 7500 rpm .

The motor has aluminium cylinder heads , gear , etc , with overall weight 110 kg . The power of the 250 twin was raised in several steps .
Opening the crank case channels and using one Bing 24 mm carburetor with cylinders remaining air cooled , gave 22PS ( German DIN HP ). Mounting two single carburetors , each 22 mm , still air cooled and home made cylinder heads created about 25 PS .
When he changed to water cooled cylinders he gained at least 30 PS. He prepared special crankshafts with needle bared piston bolts .

From this first model there has been made an Enduro , 2 race bikes and 3 tourers .

Heinz has been interested in Adlers and racing bikes for over 40 years .
He also has a M250 , Mb and Sprinter specials with 300 ccm motors .
Heinz has provided the photograph of the 3 bikes he has made .

Heinz can be contacted at ode.adler@gmx.de if anyone wants to know more about the bikes or to just talk bikes .