Throttle sticking while riding

Hey All . While riding my 2011 500ho my thottle wants to stick and my idle is high. If i smack my throttle handle a couple of times it will go back down to normal again .It wont do it when sitting at idle and give it gas., Only while riding . Trottle cable does not feel like it is binding in any way. Any suggestions as to what could be the issue ?

Thanks .:irked: