Cleaned both exhaust valves on my sled (04 pro x 600), noticed one of the bolts came out weird. Didn’t think much of it cleaned them, rebuilt 1, and put back on. Made sure not to overtighten. Sled was running mint. All the sudden heard a fluttering noise. Shut it off and opened hood to find that the valve flew back and was just hanging in there by the guilotine. I see other people have done hellicoil kits. Was wondering what size tap/drill bit/hellicoil I should use? Seems like it could use longer bolts or studs? Seems to be kind of a stupid design by Polaris.