I removed a 20" 1999 merc 60 hp 2s off of my dad's 18.5' alum bass tracker and put a 2000 honda 90 hp 4s in it's place.... we had to mount the engine in it's highest possible position and I'd like it to be an inch higher... the merc was two holes from the top and cavitated if moved up.
moving two out of three bats along with the onboard charger to the front and mounting an anchor winch on the front made a HUGE difference..... look into moving as much weight as far forward as possible before moving the engine though I suspect that you'll end up raising it in the end.
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