you dont have to buy a whole new crank, you can have your original crank checked and trued by a qualified mechanic who will tell you if it needs repair. If its ok just have it trued and welded, probably only 75 dollars if you bring him just the crank. I took mine out to have it welded and it had begun to separate. I only had pipes and intake at the time. welding the crank is cheap insurance against possible case damage, but not really neccesary on a stock or close to stock bike.