I am just finishing putting my bike back together after I had it ALL apart. While I was having the frame powder coated I put in a YZ450 auto decomp cam. I also changed the jetting back to stock since I was putting the stock pipe back on it. The bike has fresh oil and coolant and started up easily after a few kicks (I am sure it just needed some primary since there was no gas in the carb). I like the auto decomp cam-I started the bike wearing cheap flip flops and there was no starting routine. My question is after only about 10 seconds of idling with the choke on the header started to smoke. I shut off the bike and wiped down the header-thinking maybe I had gotten oil or coolant on it. I started the bike up again, shut off the choke, and kept it idling with the throttle. Again after only a short time the header really started to smoke. The cylinder doesn't feel hot to the touch but the pipe certainly does. Is this a jetting issue with the cam or did I screw something up when I installed the cam?