recently my bike started to make a really loud knocking noise i thought it may be the rod bearing but when i started to take the plastics n every thing off i seen one of the engine bolts was broke(the botlts between the top end n the bottom where it holds them together) before i start ripping it apart does this sound like the problem for the knocking noise the bolt is cracked right off so how would i put a new bolt in i never seen this happen before to ne of my bikes some one please help me im lost :bang: