I got a 2004 big bear. I just replaced the carb with an oem carb, no aftermarket. Fuel system has been cleaned and fresh gas in the tank. It cranks great and idles great. Runs perfect up to around mid to high range throttle. Then it starts cutting out and will not open all the way up. It is kinda acting like a rev limiter or firing problem. Any ideas on what this could be??? Thank you!