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I've got a 02 t-cat w/ 1100 bb. Blew inside o-ring out on head friday on both mag and center cyl. Cleaned out crank and Rebuilt it fri. night and went riding on sat and made it till the afternoon befor it blew out again. Pulling a hill and was on the nos. any thoughts. warped head? pre det from nos? I need to tear it down again and check to see how much damage I did. Gonna take the head and cylinders to someone to see if everything is true. Any thoughts or has anybody seen this before?