Re: '76 Johnson 25 hp water intake. Where?
yeah, no muffs on the older motors, just make sure you run it in a test tank with water filled 2-3" above the anti-vent plate and you should be fine. Don't be alarmed if the water gets yucky either. That's normal. If you do a bit of searching here in the forums, you'll find that hydrofoils are kind of a gimmick and usually don't do much, but mask/create other problems. You may want to try adjusting the trim/tilt and height of your motor first. The anti-vent plate found just above the prop, you should be level, or slightly higher than the keel of the boat and most folks find that trimming their motor out rot around the 2-3 pin hole from the transom is about right. I have a '66 20hp myself and I was able to improve its performance greatly simply by building a small transom riser raising the motor about 1.5".
