I am picking up my new boat this week and I went with a Yamaha VMax SHO on it. I'm like you, going from an old 2 stroke to a new 4 stroke. The SHO is performing with the best of the 2 strokes right now and even out performing some of them. I'm sure if you go with the SHO no matter if it is a 200 or 225, you will see a performance increase over your old motor. I would figure any newer four stroke of the same horsepower would give you a little extra performance over that older motor. The bad thing about the Champs though, is that they aren't built for speed. I just sold my 21 Bay Champ. It rode like a dream but people with 100 more horsepower than me on the same boat were only running about 8 mph faster than I was. I think the coastal champ hull is similar to the bay champ so I wouldn't expect any huge gains in speed. The newer outboard should definitely help your fuel bill though.
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