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I can get an incredible deal on 2000 yamaha 100 hp 4 stroke to hang on my 1978 Montauk, I believe it weighs 363 lbs. dry. It had a 1996 75 Honda on it at one time, it didn't seem to heavy. Any opinions on whether it's to heavy, fuel economy, what prop to use, etc. Right now I have an 89- 90 hp Johnson on the boat. I would appreciate any advice, thanks