Hey guys something I’m sure has been asked before, but I’m having issues with my 2007 750 brute force. Issues are after driving for a few minutes it will start stuttering backfiring and have very little power. Ive noticed it only starts doing it after I go over 35ish or wot, also after wot the speedometer stops working drops back down to zero. Had a mechanic adjust the carbs, new belt, reset light, and new speed sensor. 4wd lights are also flashing 2 second intervals any help would be greatly appreciated!