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Hello, looking for some troubleshooting tips. I recently decided to pick up a mint 1977 13' Sport with a 1997 Yamaha 40 on the back to have some fun with this summer. I'm deep in the restoration of a 30' sailboat and was in need of water time. I had an 11' Super Sport as a child and remembered them fondly. This 13' has turned out to be exactly what I needed. Anyway, I took the boat out for her maiden today and was very impressed with how she ran. Plenty fast and handled the chop very well, along with being surprisingly dry. The boat has an aftermarket stainless prop and a whale tail foil. I'm really not sure why it has the foil and I felt it made the trim too sensitive. The only issue the boat had is that the power trim won't raise the engine when at anything beyond idle speed. It will go down just fine, raise and lower fine on land and will raise in gear at idle speed. The motor sounds like it is straining when I try to trim up at speed. I had to slow down, adjust the trim and then speed up until I found the balance between running to wet and porpoising. Kinda defeats the purpose of power trim. The guy I bought it from said he just replaced the power trim motor. Now I haven't had a powerboat (other than the Achillies dinghy from the sailboat) in 20 years so I'm not a pro at figuring out the power trim system. I'm gonna get a manual for it but figured I'd ask and see if anyone has any tips, ideas or experience with this issue. The motor and trim unit is a 1997 Yami, 2 stroke electric start power tilt/trim. Thanks