That outboard is mounted very low. If you want speed you need to lift it as high as possible without overheating then start prop shopping.
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If I had to guess, I’d say you are on the second from the top hole. Mount all the way at the bottom hole and get some shallow water scoops. I added them to my Tohatsu and they made a difference, but I also run a compression plate.
Each hole is 3/4” in apart. You may not even lose water pressure mounting all the way up, but if you do, the scoops will help.
You can get them from Jack Foreman or TR Machining.
Here is a pic of the before and after of stock intakes and scoops:
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I ran hole 3 the second highest when I had my MFS60 and YBS16p prop. For me, that was the best prop. Could squeeze a little extra mph with raising the jackplate to 1.5”.
I did not run the highest hole because I found it blew out too easy.
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