Yup... that's broken.
The only way to know if it's rebuildable is to remove the head.
But... (I know you don't want to hear this) But I think that engine is probably not rebuildable. (in an easy way)
OK... we can see the busted rockers... and by them selves... that may not be too bad. (Can't say that I've ever seen that happen) But... when they broke... and the engine was still spinning at 7000 or so RPM... what else happened??? that's the real question. Also... we have a "Chicken or the Egg" thing going on here. Did the rockers break first? Or, was it the shrapnel from something else?
I do see one other thing in the first picture. Look at the top left corner at the cam chain. It's all bunched up. So... did it break? Did the the gear on the crank break?
I have a bad feeling that the cam chain broke first, and it stopped spinning the cam. BUT... the bottom half was spinning fast. So... the valves that were still open, got whacked by the piston coming up. In turn... breaking the rockers.
So... the head needs to come off. If the valve heads got jammed into the top of the piston, and broke off clean... you may be in luck, and it may be rebuildable. If they snapped off, and bounced around... the jug may be cracked, and the head dome will be beat to hell. It's still rebuildable... but it will be very expensive.
If that's the case... the new engine may approach the value of the ski. Honistly... if that was my ski, I would part it out, and buy a new one. (Parting out a ski can make you some very good money :cheers
