ok i started my bike up yesterday morning and had no problems and let it run and warm up some before i shut it off and i went to the store and got some rotella synthetic 5w 40 oil and an oil filter and changed the oil a few hours ago and when i went to start it up after it started but then died after less than a minute and i cant get it to start any more and it just backfires really bad and i havent had any problems with it doing that before. any ideas on what went wrong?

 

ok i was in the process of taking my fuel tank off and noticed some tape on my air box that had all the jetting information and such if that helps. factory pro +4 degree ignition advance factory pro stage 3 jet kit pilot jet at 38s and mini jet at 155