Ok nice boat....ive acutally been looking for one for a while now yours looks like a winner from here. Based on your converstation with the starter you have a bit of to do's going on. One would be to check the plug's are they ac delcos and the right one's??? two would be to check the timing three would be check the tach accuracy there known liars very bad and need to be accurate across the entire rpm spectrum. Now why... im quite sure that boat should be running a 16/17 pitched prop at 4800 no problem's and as you already know boats are hacked together all the time......Is the speed gps???...Little side note its very easy to spend 1-500 dollars on a prop and get the wrong one based off your current number's.... it happens all the time and by doing this you will learn the important boat fundamentals.
ESSENTIAL DATA REQUIRED
When posting a question about propellers, you cannot get a reasonable answer unless you provide the following information in your post: Items 1-4 are essential for meaningful response to most questions.
1) Performance issue you are trying to correct.
2) Current prop manufacturer, model, aluminum or stainless as a minimum.
3) Current prop diameter and pitch (required).
4) Wide open throttle RPM and speed with an average load (very helpful)
5) Engine/drive make, model, year, and HP
6) Boat make model, year, length and weight
The below link would be a much more thorough list of data to provide if you're looking for detailed performance numbers,
http://forums.iboats.com/prop-questi...ml#post2336620
