Hi All My KLX has covered about 2500kms desert riding. On the last ride out I had bad engine vibration and a horrible noise from the bottom end. I nursed it back to the car/trailer as I didn't fancy getting stuck in the middle of the desert, still pretty hot and humid at the moment here in Dubai. Stripped the engine and found that the left hand main bearing has failed, I'm going to replace both main bearings. The crank, big end/little end both seem fine. The piston and barrel both look fine. So total cost should be a pair of main bearings and a gasket set. My question is....Is it normal for main bearings to fail before the crank? Thanks, Dave.