I just purchased a like new condition Mercury 30 HP two stroke which is 650cc. My old motor was a Johnson 1988 30 HP. I'm just curious of the size of the Johnson because it is so much smaller than the Mercury. Thanks.
Not knowing exactly what 30 HP 1988 Johnson OB you had, you could research the bore, stroke and number of cylinders and do the math to convert the cubic inches to cubic centimeters... JMHO!:watermelon:
