I recently bought a 1989 vip fish/ski with 125hp mercury force outboard. The only thing mechanically wrong was a tilt valve I had to rebuild. I replaced all four plug ( cus theyre cheap) and it sounds good. I have a 13*19 aluminum prop on. It gets out of the hole and planed out very fast but my top end is only about 38mph no matter what I have in the boat for weight. I am just wondering if this sounds right to you guys. I forgot the last time I took it out to watch the RPM,s at WOT. But Ill post that later. Its a pretty heavy boat but I guess I just figured it would be fastr than that since I have a 76 tri hull 16' ( VIP is 17'7") that goes almost 45 mph with a 90hp. Any suggestions or info would be appreciated. Im also wondering what other size prop I should try and what it would do I dont know much about them thanks.