Copyright Vince Bauer - all rights reserved.
Adlerwerke vorm Heinrich Kleyer a.g., Frankfurt am Main, Germany.
The Adler MB250 restoration project.
Folks Round & Murchie, Bundaberg, Queensland.
Engine (No. 309256) :
247 c.c. Adler twin two-stroke unit; bore and stroke 54 mm.: cast-iron cylinders; light-alloy heads; C.R., 5.7 : 1; claimed output. 16 b.h.p.; Bing 1/22 carburetter; instrument enclosed by quickly detachable alloy cover; rubber connection to air filter, with strangler, fed through intake silencer in rear mudguard.
Gearbox in unit with engine; positive-stop footchange; ratios, 6.3, 7.6, 10.5 and 19.26 to 1; primary drive by helical gears; final drive by 5/8 x 1/4-inch roller chain enclosed in pressed-steel case; engine-speed clutch running in oil.
Brazed and welded duplex cradle frame with built-in sidecar lugs.
By petroil; carried out with 24 : 1 proportions.
Bosch coil ignition, with 6-v. 6-a.h. battery in battery case on left of machine, charged by engine-speed dynamo fully enclosed in alloy engine case; compensated voltage control: Bosch 6 1/4-in. head lamp with double-filament main bulb; parking light; reflector adjusting switch; ignition warning light and neutral indicating light; tail lamp with stoplight; headlamp socket for external inspection lamp; electric horn built into battery case.
Adler swinging-link front forks with hydraulic damping and friction steering damper; hydraulically damped plunger rear suspension with two-position adjustment for load.
Steel rims carry 3.25 x 16-in. Firestone tyres at front and rear; light-alloy full-width hubs, finned, with shrunk-in steel brake drum inserts for 7 1/8-in. brakes; Q.D. rear wheel.
All-steel welded tank of 3 1/3-gal. capacity. Five-pint reserve.
Wheelbase, 49 1/2 in.; ground clearance, 5 in.; saddle height, 28 in.; weight, 320 lb.
Polychromatic light green and chrome with light-metal parts in dull sheen. Alternatively black and chrome.
Full kit of tools in toolbox with barrel lock; steering head lock; tyre pump; VDO speedometer built into head lamp.
A High-performance Two-stroke Parallel Twin from Germany