Just because I haven't seen something happen doesn't mean it can't happen either. I have had my engines back fire on me [four strokes out of tune] and not had anything break. If I was strong arming it when it happened it could probably break or bend something? I just haven't seen it or had it happen. [Yet!!] One day at the field I stated I had never seen any two stroke engine flying a plane at high RPM break anything, I used to pit for a racer and a guy was flying a plane pulling more RPMs then I have ever heard at that moment. Just about then the engine broke the crank and rod!!![:@] Now I can't say I haven't seen that happen!!