I am having a hard time jetting this one. Here are the stats: 2007 yz 450 Uni filter & cage stock exhaust 48 pilot Fuel screw set at 1 1/2 turns out Stock jet needle 165 main 2300 ft elevation 80-90 degrees farenheit Premium pump gas The motor surges from 1/8-1/4 throttle when not under load. It runs great everywhere else. I have tried richening the jet needle all the way to clip 7 and also tried the nflp & nfln needles top to bottom. I adjusted the plug gap to .030 from .023. That helped a little. Help!