DEMM Motorcycles

Today in Motorcycle History


Engine: Single cylinder four-stroke OHV

Starter: Kick-starter

Bore & stroke: 60 x 61 mm

Compression ratio: 7.0:1

Engine Capacity: 172.4cc

Maximum power: 9 h.p. @ 6,500 rpm

Cylinder: Cast in special iron, cylinder head in aluminum, fitted with withdrawable valve seats and guides

Valves: OHV (Single shaft operating overhead valves which are offset from the vertical. Valve operating through two pairs of 'Gleason' helical cut bevel gears

Valves per cylinder: 2

Ignition type: Automatic advance dynamo coil - 45 Watt, 6 Volt

Carburettor: Dell'Orto

Cooling system: Air cooled (Auto-Lite)

Lubrication: Forced lubrication of crankshaft and rocker system from a mechanical gear pump

Transmission: Primary transmission through helical cut shaved gearing, chain final

Clutch: Cable operated with multiple wet disc in oil bath

Gearbox: 4-Speed foot-change

Throttle: Cable operated

Frame type: Open cradle tubular and pressed steel

Suspension: Telescopic front fork with hydraulic damping

Rear Suspension: Dual Hydraulic shock absorbers

Front Brake: Drum, hand operated

Rear Brake: Drum, pedal operated

Front tyre: 2.75 x 19 in.

Rear tyre: 2.75 x 19 in.

Seat: Duck tail race seat

Fuel tank capacity: approx. 19 litres

Source: Hessink's NL