Originally Posted by
champ20B
My brother and I have a 1997 3 cylinder 35HP Johnson. It is on a 14 ft center console and runs very well with 2 people or 4 people aboard, nearly equal. One difference for sure, compared to the the 25, is that the cylinder bore is larger. Furthermore, I believe the carburators may have a different venturi diameter as well. All else is the same (crank, rods) except that the 35 has a longer shaft, power-tilt and trim, and mandatory electric start. The 35 is a long shaft delux model engine that is more like a 50hp outboard in power and weight as well! You cannot make a 35 from your 25 unless you get a block, with the 35 pistons, and transfer all the guts of the 25 you have, over to this new block with larger-bore cylinders. You will then need the correct carburators. You would be much better off to sell your 25 and get a 35 or, better yet, find a good surplus 35 powerhead short block. I'm sure there are some dealers around the country that may have one or more of these components thereof parted out. It would definitly be worth the time and search. You will find what you need. A "real 35" on a 25 platform would be very nice to have.
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