What big bore? What exhaust did you run? Carb mods? Airbox? All these things play a huge part in your KLR performance bore kit or not. I have went abt as far as the stock motor can go (688 port valves cam) without a pumper carb or FI (which I will not do). The point is you have to have to whole package. Bigger lungs, bigger exhaust, fuel mix. They run lean from the factory but everyone wants mod the exhaust first without first richening the system causing a critical lean condition at sustained RPM. I doubt it was catastrophic failure..... Pics of damage would be nice.