Mine did the same thing. Ceaning the carb was a huge difference, as well as updating to the new thread on water seperator. I finally put a different cam and heads on it and went to a 13X12.5 3 blade and could pull 44. Also, where you have the wakeplate set can affect up to a mile per hour. Since then I have done some more upgrades and can get over 50 at 4800. If you have any questions et me know.

Jason
87 comp