My daughter has an 06 kfx80 it has a dg pipe and the 20mm dg carb. I recently did the top end with a Wiseco piston. The issue I'm having is it doesn't want to idle very good and if I get it to idle it bogs with the slightest amount of gas and also spits out the tail pipe kinda sounds like a back fire. Could this be a jetting issue??? It ran fine after I did the topped for a month or so and it started doing this. I also put a new belt and rebuilt the primary clutch. Any help or suggestions would be greatly appreciated.