Blackiron99
Cadet
- Joined
- Jul 16, 2018
- Messages
- 11
I have a custom fabricated 16 ft duck hunting boat. It's like a v-hull, but flat bottom out the back. I bought a 1984 25hp evinrude to power it. The guy I bought the boat from said it was built for a long shaft, and my motor is a long shaft. I looked it up by the numbers, and it says long shaft. However it seems like an extra longshaft. Anyway, I raised the height of the motor, based on other conversation, so the cavitation plate on the motor is roughly 1" higher than the bottom of the boat. I took it out yesterday, but the motor removed real high, and the boat didn't want to plane. It just seemed like the prop was cavitating. I lowered it about an inch, now it will plane, but it takes about 2-3 minutes, and if I try to turn it starts to cavitate and I loose all power. So does it need to be lowered more? Was the information I got saying the cavitation plate should sit higher than the bottom wrong? I need help. I had to raise the motor 4" over all, but there was no way it could stay the way it was when I originally mounted the motor. There was way too much motor in the water being dragged and it would throw tons of water up on the back of the boat.