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I have a 1100 stx di. When you give it full throttle from idle speed it doesn't go. It slowly speeds up but takes a while. The RPM's are fine when you give it full throttle it revs up so the motor isn't the problem. The ski has an aftermarket prop from the previous owner. So I'm wondering if the prop could be too far to the acceleration side or if the pump is bad? We took the ride plate off cleaned everything up and went over the bottom with a cookie on a die grinder and cleaned everything up Then we put epoxy on it to fill some of the little pits in it. its now smooth and we sealed it back up to the hull with clear rtv its all sealed up good. So, what do you think.
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