I have a 97 XR650L that I bought used. I did the usual mods and tried to jet it but recently I've been getting about 10 mpg, and first I thought it was due to a fuel line leak, but now i have a new tank setup and nothing leaks. Still getting the same insanely crappy mileage. Am I running too rich? is it even possible to be that rich? This is waaay below what I should be getting!! My question for you guys is what should I look at? Where do i start diagnosing the problem? can there be some kind of leak, this is alot of gas being lost. I don't think my speedo is broken either. Is it possible that this is a carb problem? Could it be an adjustment issue? Or will I have to dig deeper and go down into my top end? or deeper? Its a bit confusing to me because the bike almost seems lean to me and heats up a lot and doesn't hold well at a low throttle. Could someone help me out and send me down the right path to fix this issue? Thanks!