I have a stock 2011 rzr800s , new filter, plugs, and tps, tested all sensor, cleaned throttle body, removed all clutching, and spark arrestor , tested coil and wires, checked engine and coolant temps and fans. For some reason this machines idles well and. Climbs through the rpm range great to it’s hit 4000-4500 and all of sudden it starts engine cutting .. does this is drive , park and neutral also , and underload and with no load. I have spent weeks trying to find bad wiring or sensors. I already replaced the injector harness and gained a lot of improvement to this point… When purchased it would barely idle. Now it idles perfect at about 1250-1300rpm I just can’t get it to Rev up past 4000ish engine will just not allow it

Utah RZR Rentals