That is an Iron bore cylinder, you should be able to get it re-sleaved for about 150.00. Or if the damage is not too deep have it bored .020 over and do the same on the other jug and replace the pistons and rings with the .020 over bore units.
Maybe ,check out Hurley, I'm sure there might be a few JUGS you could use!! They would look good on that SKI-DDOO!!
Where have you guys been? It's been almost 30 years since you were able to bore a snowmobile/dirt bike cylinder. There're nikasil and need to be replated, or exchanged @ US chrome or Millennium technologies in WI for about $200.00 or they can refer you to a guy in MN (west of St. Cloud Tim Ekoff?) that also stocks a lot of cylinders. Next day delivered to my house in MN nice. Used to use them every year till I got the 4 storke 4 cylinder.