I figured if I could find any help on this problem it would be here. I have a predator 212 which is a 6.5 HP, the motor has been gutted and built with a stage 3 kit from nr racing. It should be pushing around 12-13 HP. When I ordered the frame from dixie he put a 9x9 hill marine prop on it. It's mounted on a 13 foot riverhawk original, which is like a fiberglass canoe, I took it out yesterday for the first time and ran into some issues. You can hold the prop at the surface of the water and the rpms will rev to 4-5000 rpms but the boat is not really moving and I'm getting a lot of spray and the motor never bogs down. Once you drop the trim/ prop below the water the motor slugs down to 16-1700 rpms and still is moving slow. The rpms will never get above 1700. I know something isn't right. There is a guy on youtube with the same setup only he is running a 9x6 and his is mounted to a lowe 1436. could that lil difference in prop size kill it that bad? Any help here would be awesome. Thanks

Here is a video or pic, not sure which one uploaded

I wouldn't think it would be the prop. Friend of mine just put a 5.5 on a Dixie frame with 9x9 prop and he gets 16 mph, granted his boat is only 10ft and weighs 125lbs

Yeh I'm not too sure, going to run it again today and see what's wrong

its your prop. try a 9x6.