If Your ATV / Dirt Bike Won't Start or Runs Rough, it's Likely 1 of These 3

Air, Spark, and Fuel! These are the elements needed to run. Trouble shoot each and eliminate them as you go. Eventually you will discover the source of failure.
I hope I was able to help! If I did, please let me know! :)
I love you all!!
- QUADNATION