I sold the ski 2003 Gtx di. Came back next day they popped the nut out of rear for reverse cable flood hull. Got all the water out of engine and got it running . Here's the problem:It starts but wont rev up at all . Just keep hearing the bouging sound. Douse this sound like the magneto isn't functioning properly. If not what do yall think is the problem is. Trying to keep the buyer on the hook