Nothing against SBT especially when you're just the average coucher looking for a STOCK motor that will give you the piece of mind of having a great warranty, but personally I wouldn't buy one for a superjet that I wanted to mod. You could probably rebuild your motor yourself for less. I've never rebuilt a motor myself, but I'm pretty confident I might be able to especially with the help/guidance you can get on this site.
If you do any regular work on the ski like replacing a starter and exhaust, etc.
You could follow a general video guide for the first time just to make sure you do everything in the right order, but after that you'll see just how simple a 2-stroke motor is. Especially a general water cooled 2-cylinder.
You have the cylinders bored/honed/reseleeved whatever needs done at the machine shop and get that back and order the piston top end kit before this for final sizing.
Then you can put it back together. Especially if it was running and the cranks good. You can just do new crank seals and new crank case yamabond sealant. And all new gaskets all around.
There's some really good basically literally start to finish engine rebuilds on YouTube. And he does superjets motor 701/760 basically the same motor.
Plus you can use good quality parts and save on the assembly of it all, which really isnt anything crazy hard.
