Hello! I have a 2007 Polaris Outlaw 90. When I slowly increase the throttle in gear it starts to backfire through the carb (spitting ect...) It occurres right about when the CVT starts to engage. I have have the carb apart and have cleaned it spotless. I have checked for vaccum leaks.. none. The only mod i have done is I cut out the baffle for the exhaust. Should I increase the Pilot jet...ideas ?? Also can someone please confirm the "D" shaped air/fuel mixture screw is supposed to me turned clockwise to richen it up. Thank you !!!!!