I have a problem with my 2013 krt 750. No power and only goes 20 mph and starts to jerk when I get up to 12-15 mph. I've changed the spark plugs, fuel filter, air filter and still same problem. I also was wearing my seat belt. I noticed when I turn the switch to 4 wheel drive it goes in pretty easy. When I switch back to 2 wheel dr the light keeps jumping back and forth to 2 wheel to 4 wheel quickly. It doens't settle in unless I turn the engine off then on again then it will say 2 wheel drive. Any one have any suggestions?