After riding yesterday I'm looking to fine tune the bottom end of my yz 250. Our altitude is from 5000ft. and above. I've got a reed block spacer and flywheel weights. The pipe is a gnarly w/turbine core sa. There are a few needle choices in the manual. I want to know if anyone has found a good combo to use as a baseline. The pilot and main jets are both two sizes down from stock, and the needle is in the 2nd from top position. The needles get pretty spendy so I hope someone has done this and found a good combo. Thanx