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Just picked up my fcr for my 400s converted SM. Purchased from keihin-fcr.com. Jetting is 160 main 45 pilot emn needle, 3rd clip, as per the website. I also have a powerbomb header, powercore 4 slip on, and the usual 3x3. Carb was a PAIN to get on as I'm sure you all know, but it's on. Bike fired up, idles great, and blipping the throttle sounded mean! That said, i feel The bikes top end is lacking; something is not right. All is good up until about 3/4's to full throttle. In the upper rev range, it's even more noticeable. The bike is only able to do 87 on its 15/44 gearing, and I know it should be able to do a bit more than that. The bike sort of Boggs, or kind of pulsy at WOT; it almost feels stronger at 3/4's throttle. Ive posted in the DRZ Facebook page and lots said I should run a bigger main.... I questioned that. 160 main is what many say is right on, if not, a tad rich... i took my air filter off and also airbox cover and drove it, and performance was worse. Less torque and less power. I'm pulling the plug right now to analyze what it looks like as well. Others suggested fuel screw adjustment, but I was under the impression the fuel screw revolved around pilot circuit. My bike idles perfect, and starts great. Also has pretty good kick in torque at 1/2 throttle, so I'm a bit confused. Any advice?