It will cost more to put that 717 in that SN than it will be to get a 61x in there properly. You're going to run into clearance and alignment issues just like with the 440. I'd scrap that whole idea. My motor was cases, crank, cylinders, and head for that price. The thing about the 717 is even if you get it in there and running properly you will be limited on future mods, where as with the 701 they are endless. You have different case cylinder combos, plentiful a/m exhaust pipes, heads, and ignition set ups to get some major power when you and your wallet are ready for it. Honestly seadoos suck as much as the 440s and 550s. Ive cut up and thrown away several seadoos and js hulls and scrapped several of their engines. It honestly made me feel good inside, I now ride nothing but Yamahas and that is what I will stick with.