A start to finish look at the process of splitting and rebuilding the crank from a Royal Enfield 500 Bullet, removing the worn components, replacing with new items, then reassembling and truing the rebuilt crank to minimal run out figures. An engine could run with quite a lot more run out than this and appear to be 'O.K.', but for the longest life from the main bearings and the smoothest running possible, it is best to have any run out present at as little as possible, although 'Zero' is rarely achieved.

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