I want a motor like this.

Trail beast is on it. That would end up being on the order of a fifteen piece crank. Just truing a banshee crank kind of sucks at seven pieces. For reliability you'd have to weld it, for longevity....

I disagree on the block. There is plenty of room for porting with cam and valve gear gone. Heads would be a cinch. hardest parts are heat rejection and exhaust design. Two strokes don't generally favor sharing exhaust; banshees get away with it due to 180 degree crank. A V configuration would REALLY complicate that!

They're out there. Rudezon is the outboard that was mentioned previously. Lots of info on those outboard motors.

Fuel consumption sucks, and honestly, lack of full power band sucks on the street. It's still the most fun of road you can have though!