Guys not my pwc but it was bought by a friend supposedly rebuilt guy garrantee'd 8 hours ride time. Anyway first trip out starts hard and when you finally get it started it gets out of hole fine comes up on 6200 then bogs down to 4000rpm if you play with throttle it will run 5200 at 3/4 no problem. I'm not firmiler with rotex so don't really know where to start.Carbs I'm thinking any idea's would be appreciated. His book is 3hrs away I haven't even seen engine or ski yet but he wants me to take a stab at fixing it. thanks, Nate