well performance I would say is kinda tricky... I have owned the boat for about a year and a half now and was battling an overheating issue and resolved that issue by replacing everything possible that would cause the engine to over heat and it stopped according to my thermal temp gun. Now for the present information regarding the performance of the engine I still are battling a slight problem that I can't figure out is that I am unable to run the motor any higher than 3400 rpms without the engine acting as it is going to over heat or go into slow mode. When it does this I literally turn the engine off and then fire it right back up and are able to go back to running the motor without any problems. Everything checks out good for the engine as far as good compression, and also a good reading on the tach. The engine is able to reach wot at 5500 rpms but can only stay at that speed for maybe a total of 30 seconds before it acts as it is overheating or go into slow mode at which I have to turn it off and crank back up in order to like reset the engine. As long as I stay at 3400 rpms the engine performs well and no problems and at this speed I am able to reach 38 mph. At 5500rpms though I am able to get the boat to 52 mph at wot. I just took a look at the prop I have now and it says it is a 14 1/2 x24 pitch prop which I feel is not the original prop for the motor cause it sounds as the pitch is way to high??? Any ideas possibly could the prop that I have now have been causing the engine to not go any higher than 3400 rpms for a longer period of time than 30 seconds? Please help and advise...