80's 23's are heavier hulls and have a larger fuel tanks. You'd have to work hard to only get 30mph out of it . . . even with the bottom covered in barnacles dragging buckets and running on 5 cylinders you should still be able hit 30mph. There were different flavors of yamaha 225 (2.6L 225 1989 - 1992) yamaha excel 225 2.6L (86 - 89'ish) and then the large 3.1L displacement versions after 1992 (v76, ox66, etc.)
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