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Message: [QUOTE="Coop, post: 1275229, member: 17169"] I used to work as a mechanic and my opinion is it was the lower rod bearing. I rebuilt a 1984 KTM125 about 8 years ago. I tore it down, split he cases, the lower rod bearings felt great so I didn't open the crank. Rebuilt it, first ride the exact same thing happened as you described. Even though there wasn't any play, the inside of my rod and the pin both were pitted from the bike sitting and that gave the bearings room to wiggle and explode. It was an expensive lesson. Now when I am rebuilding a bike of unknown history I spend the money to inspect the rod, bearings and pin. [/QUOTE]