1955-56 ADLER MB250S SPECIFICATIONS
       
Engine: air cooled 2 stroke twin
        247cc
        bore:54mm, stroke: 54mm
        loop scavenged, alloy pistons
        compression 6.6:1
        BING 1/22 single slide carburetor
        main jet: 115
        pilot jet: 35
        needle: 3rd top
        needle jet: 1608
        multi-plate clutch in oil bath
        twin ignition coils
        spark plugs 225 to 260 heat range
        electrode gap: 0.6 - 0.7mm
        twin breaker points, 0.3 - 0.4mm gap
        timing: 2.45mm Before TDC
        output 18 HP DIN @ 6200 rpm
Lubrication: 25:1 petroil mixture.
Fuel consumption: 3.56 l/100k @ 80 kmph (79 mpg)
                  2.68 l/100k @ 60 kmph (105 mpg)
Gearbox: 4 speed with neutral indicator
         oil capacity: 1.2 litres
         foot operated lever on LHS
         bottom=neutral, up = low-2nd-3rd-top.
         low gear = 2.80:1
         2nd gear = 1.53:1
         3rd gear = 1.11:1
         top gear = 0.81:1
         primary drive = 3.44:1
         final drive = 2.0:1 
Max speed: 126 kmph
Dimensions: height:     935 mm
            width:      620 mm
            length:    1975 mm
            Wheelbase: 1260 mm
            Weight:     145 kgs
Wheels: 1.85"x16" steel rims with 36 butted spokes and fully floating axles.
        Large diameter alloy hubs.
Brakes: 180mm diam x 30mm wide twin shoes.
Tyres:  3.25x16, front:    15.5 psi
                 rear  (solo):    20 psi
                  "    (pillion): 27 psi
Maximum permissible total weight: 295 kgs
Frame: double tubular brazed.
Fuel tank: rubber mounted 15 litre with 3 litre reserve.
Rear suspension: hand adjustable progressive telescopic 
                 with hydraulic shock absorbers.
Front suspension: anti-dive swinging leading links with
                  built in hydraulic shock absorbers.
Electrical: 6 volt 90 watt dynamo, voltage controlled.
            6 volt 6 amp hour battery.
            35/35 watt dual beam headlight 160mm diam.
            5 watt stop light, 3 watt tail lamp
            1.5 watt parking headlamp, ignition warning,
            and neutral warning lamps
            0.5 watt speedo illumination lamp
            Electric horn.
Anti theft steering lock.
Lockable tool case.
Adjustable steering damper.
Enclosed rear chain 5/8" x 1/4" links with 10.1mm diam. rollers
Folding rear mudguard for easy wheel removal.
Two stage oil bath aircleaner-silencer.
Twin 900mm x 80mm upswept silencers with removable fluted centres
 for cleaning.