Last year I bought a BM heart throb clutch kit. After the first 150 miles the primary spring broke. After the second 150 miles the second primary spring broke. When I asked for my third spring from BM, I requested the color of an Arctic Cat spring that would work. When BM emailed me back with the info they made a comment that maybe I had a bent crank. I although I took this with a gain of salt it did make me think. Up till this year I was taking the clutch off with a long handled breaker bar because I didn't have an impact like I do now. Is it possible I bent the crank? I have heard that bent cranks are more common in bigger displacment engines that have blown belts at high RPM's. How do you bend a crank other wise? Can I check it or do I need to take it to a dealer? If so how much cash to check it out? I ride a 99 ZL 600 Carbed with approx 3200 miles. Any info will help, after Im done working on the kids sleds I'm going to go through mine. Thanks in advance.