ok im still kinda new on this whole jetting the quad part. i know there is alot that comes into play when jetting the quad. my question is does anyone have an idea what size jet needle i should be useing when rideing in the kentucky/tenn area ? since im new to it i really have no idea where to start. if someone could give me some tips or ideas on where to start.

Me too. I am also riding in TN,area . I just bought an 07 450r n the guy put on a slip on and main jet ,he said. I am taking it apart tomorrow to see the size. I am also getting a head pipe. it runs strong but falls on its face when it going from idle to a quick full throttle. I will be learning as I go about this. I have had some luck with carbs in the past on different bikes and just need to get into this. If anyone knows what the stock jet sizes are I would like to know to give me a benchmark. I'll keep you posted

awsome man thanks. im getting ready to add on a DG X2 oval slip-on exhaust. the guy i got it from pretty much tore everything out of the inside of the stock muffler, and i was reading something one day in a mag. saying that pulling it apart like he does takes horsepower away. so i figured if im adding the new exhaust why not jet it while im there.