I have an electric Kart Lift and really like it. But I haul my gear in an enclosed trailer. It would be nice if it had a smaller foot print as that seems to be what most racers at our track would like to see as it is a quality unit for the money.
Check your throttle cable for the idle issue. Some cable ends are to long or to big and don’t set in the slide recess. I believe this puts things in a bind and wont let the slide return to its lowest point to where you can get an idle. Mine was so bad, the idle screw had “No” effect on idle adjustment. If you don’t have it already, Briggs has a carb tuning guide on there web site. Follow their guide and you should be ok. http://www.briggsandstratton.com/engines-racing/~/media/Racing/carbtuningguide.pdf