Ron, This is very cool to have your thoughts confirmed. This definetly helps to have a second opinion. As for possibly being able to take a larger main. This is probably been the only change that I am making that is outside of James Dean's recommendations. James has been scarily accurate. When I have tried james's recommended settings for my bike they were perfect first time out. As for our DSP exhausts needing larger exhausts, who knows? It sure is one large, meaty pipe running through the frame rails. And maybe the tapered header helps exhaust the gases as well? The other possibility is that I have drilled out my MAJ and MAJ passageway, so maybe I can take a larger MJ. But here is what I am thinking. The bike ran great at 8,000 ft when on the 172 main. I could feel the bike load up on the needle EKN#5 = EMN#6 and then when it came on the 172 main, nirvana, so how can a 175 not be better at sea level? This weekend I am going to race the SRA GP at Carlsbad. 30+ beginner class. All right I am not the fastest guy. So for this weekend I will atleast keep the EKN#5=EMN#6 , 175MJ settings. But if when I go up to silverwood/ arrowhead 4,000-5,000 the EKN#5=EMN#6 setting is still too rich, then I am going to go to an EKN#4.5 and increase the accelerator pump. After the BK mod (w/.3 sec squirt)this is what I noticed about the needle settings. EKN#4=EMN#5 - Bike flat just dies off of idle. EKN#4.5=EMN#5.5 - It is pretty hard to stall it gasing it right off of idle, but still possible. (maybe curable with more squirt). EKN#5 = EMN#6 - Throttle snap problem of idle solved. But maybe too rich at 8,000ft. Being lazy by nature. I want to get a setting that is perfect 0-,6000 ft, so I don't have to do any jetting changes. Thanks for you input as well. ------------------ 2000WR - EKN#5, 172MJ, 226MAJ, MAJ Passage drilled to 278, 48PJ, 100PAJ, YZ timing, BK mod, 3/4 turn pilot screw, DSP tapered header and pipe, IMS tank & YZ seat, Scotts dampener & triple clamp & Renthal Fatbar 971, White Bros suspension, Dunlop 756's.