|1902 Norton 'Energette'|
|Crankshaft flywheel on the Clement engine|
"The Clement engine was 55 X 60mm bore and stroke ( about 140 cc) and had an atmospherically controlled inlet valve and a mechanically operated side exhaust valve. The crank, drive side main shaft and pin were all forged as one piece out of tough steel and case hardened and ground dead true afterwards. The aluminium crankcases were clamped to the inside of the front down tube and to the right of centre. The drive side main-shaft held a 7 ¼ inch O.D. flywheel which had either a sprocket or pulley bolted to the inside and consequently balanced the motor within the frame; so the theory goes! The pulley (or sprocket) then drove another pulley or sprocket, situated below, but in front of the pedal crank, and this, in turn drove the rear wheel pulley by the period leather belt. There were variations on this theme that sometimes included a jockey wheel to maintain the rear belt tension. The rest of the machine was basically a period bicycle and consequently pedals drove the rear wheel by the usual sprocket arrangement including a free-wheelin’ rear hub. A small petrol tank was suspended beneath the top frame rail, ignition was ‘electric with positive “make” trembler’; and ‘A coil, giving a strong spark and accumulator of 20ampere hours capacity’ (ref: Supplement to Motor Cycling 7.5.1902) The whole machined weighed about 70 lb (32kg) and was probably not much faster than a good athlete on a sports bicycle!"
|George Cohen, his 1902 Norton, and Sammy Miller (who has one too!)|