hi i recently got a waveraider 760 for free from my aunt and i got the carbs completely cleaned and rebuilt by a yamaha dealership. i put the carbs in and the ski fires up, now once it was idling it would sometimes randomly rev up and hit rev limiter, and stay revinging i have checked the throttle cables and dont have a problem there the cables operate fine. when i gas the throttles it bogs and then revs and sometimes the ski will stay reving even after i let off. i also have had a problem when its the motors reving the killswitch does not work i have to double tap the gas to get it off the rev and then it will die any sugestions ?

carbs have been rebuilt and has new spark plugs