OK I'm hooked. Just been reading Jetting Q's, it's 0120 hour and I have to get up at 0415 hour. Can anyone tell me where in OZ I can get a Pilot air screw or a website for Sudco, etc. I have the annoying vibration/misfire just off tickover (just when the slide is raised) and would like to play around with the pilot curcuit. Also I can turn the pilot screw right in and it still runs ???. From previous bikes this would stop. The bike also revs out well to a stage then take a little bit of time to hit the rev limiter in 4th with 14/50 gearing. I am running a WR426 2001 Aussie model with : Stock stainless pipe Airbox lid off YZ timing Aircut mod BK mod 42 PJ 75 PAJ OBELN #3 162 MJ 200 MAJ After reading the Jetting Q's I have a much better understanding of all the above but anyone's thoughts/ideas (Taffy/JD) would be appreciated. Hoped I didn't put anyone to sleep ?. Chucky.