I have a 1998 Yamaha Banshee. I bought it two weeks ago. It had burnt a hole in one of the pistons. They put new pistons and rings in it for me. It burnt a hole in the same one again. I was thinking it could of been too hot of plugs, but I really am not for sure. We put colder plugs and new pistions and rings back in it. It still aint running right, when I'm driving normal it feels like it is running on one cylinder, but when I am completly accelerated when the power bands kick in I can feel and hear the other cylinder kick in. I also can hear it cutting in and out on that cylinder, but it doesn't do too bad when completely opened up. When driving normal in drives very rough. Plus it doesn't idel because they eliminated the TORS, I believe. It has a cool head, FMF gold series pipes, power core silencers, outerwears airfilters, wiseco pistons, and an uncertain size of jets. Can you please help me with my problem? and what size jets would you prefer.