I am a relative noob to the YZ400F. I have a '99 that i just swapped to a 450 exhaust cam, properly timed and shimmed, and a 2005 450 carburetor swap. The carb swap made it a whole new bike, I am almost sorry that I performed the cam swap. Before the swap, a cold start consisted of 4 kicks choke on, decomp lever pulled, a couple twists of the throttle, then one kick just after TDC. I have the easily adjustable fuel screw, and I have spent some time dialing it in for good idle and rideability. After the swap, I am kicking quite a few times with the choke knob out, walking away frustrated, and kicking some more, twisting the throttle a few times, getting some pops out of the muffler, then it finally starts and idles for 20-30 seconds before I shove the choke in. My last big Yammy was a YZ490. I really dig this water pumping 4 stroke, I just wish it would start as easily as before the cam swap. What starting procedure works best for you other decomp swapped 400 people?