old motor sat for 6 or7 year replace lower unitt motor run,s good but not to fast at all

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you can get much information in this website, If you will check anyone blue link in website.

What is fast? l would think it should move at a brisk pace, but not plane if that is what you are looking for.

If you do not have the power to get up on a plane, you wont be able to go much faster than 1.6 X the square root of the waterline, say about 5 mph, without using a lot more fuel and throwing a large wake. If you can get the engine tuned up, lighten the boat, trim the boat correctly and get over that bow wave, then a planing boat of that power might do 10 or so miles per hour. l can plane wit a 8 hp on a 11 foot rather heavy whaler.