I have a 50 hp Mercury outboard. I know it shares the same power head and all as the 75 Mercury. Can i turn it into a 75 with bigger carbs?
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I have a 50 hp Mercury outboard. I know it shares the same power head and all as the 75 Mercury. Can i turn it into a 75 with bigger carbs?
No, there is a lot more to it than just carbs.
What else is different? It has the same bore and stroke, same size and weight.Quote:
Originally Posted by Barnacle Bill
The best thing to do is get a copy of parts lists for both then compare. Look especially at manifolds, reeds, exhaust tuner and switch boxes.
Mercury Marine Parts
Will do thanks.Quote:
Originally Posted by Barnacle Bill
It could just be compression [pistons] and bigger carbs.
Yup, possibly just compression ratio higher (domed piston, and/or smaller cc combustion chamber) AND carb jets/ reed plates. Most 150's, 175's, and 200's are ALOT the same....bore/stroke, weight, power head, etc. But the "other" things change the HP, like jet size in carbs, reed plate "flow"/design, and timing (advance).
Do some research on these reeds OUTBOARD - PRODUCT SEGMENTS , I know they woke a few dirt bikes for me in the past, thinkin about installing a set in my 90 two stroke, also check the the blades in your carbs now, to make sure they are completely open at wide open throttle, if not adjust cable to completely open blades..... A lot of people aren't aware that they loosing performance from things like that.