1952-53 ADLER M250 SPECIFICATIONS
       
Engine: air cooled 2 stroke twin
        247cc
        bore:54mm, stroke: 54mm
        loop scavenged, alloy pistons
        compression 5.75:1
        Amal 20E1B single slide carburetor
                main jet: 125 (1952)
        BING single slide carburetter
                main jet: 115 (1953)
        multi-plate clutch in oil bath
        twin ignition coils
        spark plugs 225 to 260 heat range
        electrode gap: 0.6 - 0.7mm
        breaker points, 0.3 - 0.4mm gap
        output 16 HP DIN @ 5590 rpm
Lubrication: 25:1 petroil mixture.
Fuel consumption: 3.6 l/100k @ 64 kmph (120 mpg)
                  1.9 l/100k @ 50 kmph (148 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 (solo), 2.25:1 (sidecar)
Max speed: 116.5 kmph (73 mph)
Dimensions: height:     935 mm
            width:      620 mm
            length:    1975 mm
            Wheelbase: 1225 mm
            Weight:    135 kgs (1952)
                       145 kgs (1953)
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, without sidecar (solo):    20 psi
                  "    without sidecar (pillion): 27 psi
                  "    empty sidecar (solo):      20 psi
                  "    empty sidecar (pillion):   27 psi
                  "    occupied sidecar (solo):   27 psi
                  "   occupied sidecar (pillion): 37 psi
                 sidecar:  18.5 psi.
Maximum permissible total weight without sidecar: 295 kgs
                                    with sidecar: 420 kgs
Frame: double tubular brazed with sidecar attachment points.
Fuel tank: rubber mounted 12 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 friction shock absorbers.
Electrical: 6 volt 60 watt dynamo, voltage regulated,
            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.
Twin 700mm x 70mm downswept silencers with removable ends for cleaning.