The only thing is you may find the weight difference is quite dramatic at that size-possibly enough you can't carry it any more.
If you're selling a 2s to buy a 4s, you'll have to use the boat an awful lot to make the saving in fuel up to the difference in price as well.
If it was me, I wouldn't be looking at a repower at 15hp, I'd be looking for a bigger boat.
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