Dear All This is a rather strange question for you one that i can find no conclusive argument to. when riding a large motorbike i am informed that the engine must be reved at low speeds in order to keep the engine spinning at a sufficient speed to enable it to generate a strong enough gyroscope to keep the rider and the bike upright. can anyone find any merit in this or is it just all bollocks? I am interested to know as a friend of mine owns a large Harley Davidson and i want to know if he is simply keeping the bike up or just being bad by reving his engine in car parks. Many thanks Yoma edit: i also found this:http://www.misconceptionjunction.co...ng-to-do-with-keeping-you-balanced-on-a-bike/ suggesting that the wheels of a bike do not actually provide a effective gyroscope. i am interested in the engine though.