I have a 2009 rhino 450 the rhino started to idle rough then it coughed threw the carb and stopped running i set the valves at exhaust o.16 intake 0.08 the motor sounds like there is a clicking or tapping noise in it i plowed snow for 2 days today it started to miss and cut out again and coughed thriugh the carb and stopped again i have to choke it like before to get it into my garage the fuel filter seems to have gas in it the carb has been completly cleaned out the valves are set could it be the rings any help or answers?