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I have 80's vintage evinrude 9.9. Bought a 15hp carb on e-bay. Went to put it on and noticed venturi diameter on new carb was alot smaller than my 9.9,so i'm sure new carb is not a 15hp. E-bay seller said that it did come off of a 15hp. Would like to find out how and if a carb can be identified...