Hi, I need some help with my ski, it starts and idles ok once it's warm but when you give it throttle it has no power, sounds a bit spluttery and wont get over about 4000 rpm. A wlile ago it had dirty fuel go through and blocked up the carby, making it run like crap, so cleaned it out and it was ok but started running like crap again ( didn't clean fuel lines). I tried to clean it again but couldn't so I got the local marine shop ( boat engine mechanics) to put a carby kit through it and it runs like I described still. Any ideas?

Sorry made an error, it's a 94 model.