bought this ski last year and ever since I used it it always starts hard. motor was rebuilt and has like 20 hours on it. it has good compression, new plugs, new battery. starts right up out of water but really hard in water. it will turn over good but will either kill the battery trying to do so or it will finally start and run boggy for a minute then runs beautifully. I can ride it for 45 minutes straight, get off and my wife will hop right on it and same issue. Any ideas?