engine miss at high rpm
have an 07 rhino motor is stock. i am running a k&n filter,big gun exhaust,carb has been jetted,cdi box. rhino starts and idles like a champ but as u get 2 bout 40mph it will sputtr. it is really noticable n the neutral position or goin down hill. motor has 1600 miles on it. oil gets changed every 300 miles with filter spark plug is factory ngk and changed every 500 miles but is usually burnt pretty bad.fuel filter every 500 miles. tore carb down yesterday and is spotless.any suggestions on what 2 check next. run cheap gas is high octane gas betr or what about running seafoam 4 fuel treatment. oh yeah the sputr will not kill the motor just enouh 2 piss u of.