So, a couple things, in making my new exhaust, it seems to backfire a bit. Thinking of an exhaust leak, I don't remeber seeing a gasket in the exhaust. Is it just something that is fitted into the pipe? Or some rubber thing that is compressed between the exhaust and the head? Also, would a hotter spark plug help the backfire? I know in the owners manual it says if there's carbon deposit to switch to a different one. Didn't know if that would do anything. Also, my sputtering is back. I had used the gum out and it seemed to fix it, but a couple tanks with out it, and I'm getting the same problem. Anything I could clean to fix it? It's almost like it's not getting gas, then jumps when it does. This is only at like 3000-3800 rpm though. Didn't know if that fuel strainer could come out easy enough and I could clean it? Would a higher octane gas do it? I'm just sorta out of ideas. Thanks for any input.