The dnieper was still not cooperating

By

 DNIEPER 650...


A considerable amount of thought power was poured in Annabelle's Dneiper which was steadfastly refusing to run. Annabelle, Guy and Phil had tried various things to get the beast to come to life including replacing the bike’s carburettors but it refused to respond.  Instead it gave us tantalising signs of life without starting with the occasional pops and splutters.  It even fired for a few revolutions.  The bike has a manual advance and retard mechanism.  This means that the rider controls the amount in advance of top dead centre that the spark plug is fired at. To cut a long story short, the spark needs to occur further in advance of top dead centre at higher engine speeds than it does at low engine speeds. As engine design advanced the function of altering the ignition timing was taken over by automatic advance and retard units. These consist of a pair of weights which fly outwards against the tension of springs under the effects of centrifugal force.  The faster the engine is going, the more the weights fly out.  The more the weights fly out the more the points cam turns in relation to the shaft that is turning it. 


Ah well, a little more head scratching would be required before the Dnieper would be a runner.