Miss, backfire through carb, rough idle. Also at roll on and steady speed. Hot or cold. Load or no load. Since it came out of the case. 2012 Installed new fuel filter at PDI and changed at 50 mi. Bike has less than 100mi. I've seen several posts concerning carb problems. I did rejet the stock carb (110). Plug is tan like it should be. Not a mech so I'm guessing maybe valves - haven't checked them but will when I get a few more miles on her. Emmisions crap is gone and hole plugged. Did leave the crankcase breather on but it is exposed to the air as I installed a new air filter of about the same surface area.