i have a 04 trx 450, full fmf system, kibbler white valves, 11.5 piston, hrc air box lid with a k&n filter. installed a fcr carb off of a 07 rmz 450, current jetting is 168 main, 50 pilot, clip is 3rd down on needle, it has a r&d power pump on it which adjusts the leak jet size, its about a 35 according to the number of turns, fuel screw is at 1 1/2 turns. it has good low end but a miss in the higher revs. from what i have heard these carbs are to be a big improvement to this quad. any ideas would be great. thanks