Problem: -Bike won't start without choke AND hot start. Once started, It will run without the hot start but it must have the choke on. Bike: -1999 YZ400F, obviously 39mm Keihin Flat CR. -FMF Powercore 4 exhaust on a stock header. Carburetor: -All jets cleaned well and reinstalled. -Jets all at stock numbers (starter 65, main 175, pilot 45) and Pilot screw adjusted for the exhaust pipe (2.5 turns out) -Float bowl height checked and reset to stock 9mm level -Accelerator Pump diaphragm looks great. -Yeah, my slide is square side down. Yeah.... carb issues like the rest of everyone. Looking for a little direction. I will admit.... Passageways not given the attention they need. When it comes off again, I will take care of that. I'm looking for other possible problems to look out for while i'm in there.... The bike seems like its breathing hard and not getting enough gas OR too much air. Where are possible trouble areas for all these issues? This is the last time I work on this carb.... If I rip it out again its going to the shop and getting completely worked over. Thanks ahead of time for all the help I may or may not get. Haha.