ORIGINAL: Ruger-777
Sounds like your carb isn't closing enough, take off the air filter and look inside the carb there should only be a 1mm gap when your radio is at neutral. Sometimes you can trim it closed more with the trim knob or button on the radio or you may have to adjust the linkage. Hope this helps
not good practice(will agree on the carb not closing though)
take the arm off and adjust the screw next to the carb while closing itmanuallt to 1mm(might have to loctite it seeing it can vibrate loose). Than adjust the arm till its at that point.