I need help, my 07 rhino backfires through the carb at idle. It only has 22 hrs on it & is stock except for A BRP CDI. I have fresh fuel in it, a new fuel filter & I have removed & cleaned the carb twice. I have looked over the boots & sprayed alot of starting fluid with no change in idle. Besides at idle it runs perfect. I am thinking about the air/fuel mixture but I have not seen it when the carb was off, I need someone to post a pic of it. Please help.