Re: No more than 12 mph
how to check the outdrive to see if i damage the gears and check if the prop spund?
Forget the gears. if that were your problem you wouldn't be posting about getting up to 4500 and going 12. You'd be asking about the racket of your drive eating itself, and you wouldn't be going 12mph for very long. Drive gears are either engaged or not via the dog clutch, they don't slip. If the clutch is not fully engaged again you are going to hear quite a racket.
As for the spun hub, telltale signs are usually little beads of rubber around the inner splined hub. Best way to test is put a new prop on. Again I don't think it's the prop being spun. Once you apply enough torque to start it spinning you will usually fall off to no propulsion. It usually won't allow you to slip at a fixed rate and maintain any measurable speed. BUT a spare prop test is very quick to rule it out. It could also be you have too much prop on the boat. What size are you running? I still think you have a setup problem preventing you from getting on plane.
The trophy is still a sizable boat for that engine. That vintage is only 300 lbs lighter thank my old Ciera, and I can tell you, if the engine is not timed and tuned perfectly and your drive and tabs are not set properly you are going to plow water all day long. And if your prop is even off by one size you'll never get up on step. It's not just the weight. 20' of Deep V is a lot of water to push out of the way for that little engine.
