Ok so I am a total dork when it comes to jetting. I can play around with main and pilot a little but not these fcr carbs. My 04 wr450f just got upgraded to a FMF muffler from a stock with gytr tip. It's running a cut out airbox intake, I think I have the tps unplugged as it was giving me issues, and is otherwise pretty stock. Current jetting is 165 main jet 45 pilot 65 other jet next to those two. Most of my riding will be done around 1500' elevation. Currently, at around sea level (100') I have the fuel screw bottomed out for best idle. Now to me this would indicate a rich pilot but at 45 it seems good. This is a bad aluminum mix screw as a lot are. I would like to know what jetting would be best to put in this? Different needle? I honestly don't really even know needle position. Maybe dead in the middle if I recall. The pipe came from a wr250 but the pipes are the same so it shouldn't matter. The mix screw will get an update eventually. Any help much appreciate!