Took my foreman to the lease today for the first time this year and it started cutting out when in a bind in the mud. It wont rev up to high rpm. It starts sputtering and losing power. Im wondering if its the carb, valves need resetting or maybe head gasket. It starts fine. Idles great, and runs good as long as its not in a bind. As soon as i gas it, it starts sputtering then wants to die. Any suggestions? Thanks.