Hello, I have a 2013 XTZ 1000 that I just purchased. The machine smokes under a load and not at idle. It seems to me it is running very rich even makes my eyes water! It runs very well and I have put new plugs, changed the oil and checked the valve lash. I have done some reading about possible fuel pump, regulator or fuel injector issues?? I also have to mentioned that it has a speedwerx slip on installed on it (I don't like it as it it too loud). I would be willing to trade a stock exhaust for this one if anyone is interested? Thanks for the help in advance.