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The Yamaha F70 I ordered in March finally arrived. The dealer was closed due to Covid and is swamped, so we have been given the option to install the F70 ourselves. He will sign the warranty. It is going on my 1974 Montauk. I have a pretty good understanding of the mounting issue from the site and we will go with 2 holes up. I dont see anything difficult with doing the install, we are working men and are restoring a classic car. I have removed the old outboard and plugged the holes where the lag bolts were.
Couple questions.
Is there a specific sealant that is best for using around the holes?
Any odd pitfalls to watch for during the install?
Going forward i will need some help from the experts on here regarding the prop selection. I am the guy who does all his fishing at 5500 ft elevation .

Thanks Joe