Yup had a set of KB break right on the top.
How much HP were these engines pushing?It was caused by the parts of top ring land that broke off.
Ok mine were filed to KB's specs. Specs were taken right off from their tech department. Didnt have any problem with the ring end gaps butting up against each other. So what cuased mine? I would like to know. KB will blame ring gap on any of their pistons that fail. If you are having that much of a problem with a pistons popping the tops off of em maybe they should look into their piston design.The only reason the top ring land breaks is because of improper end ring gap. You MUST file your top ring to KB's recommended specifications.