i think its screwed

nice day here today took my snowmobile out was running like crap knew what was wrong jets plugged up from sitting all summer , so i took the carbs off and cleaned them put them back in and away i went . got about 2 miles down the road and the engine seized right up. i dont know if it was me or if the couple back fires prior to claning the carbs did it but the oil injector tube on the lt cylinder was off and i drive it 2 miles on a warm day with no lube.
got it back home and its fires but now will not start. and the engine is tight.
like i said i think its scewed. :CRY: :CRY: :CRY: :CRY:

The plugged jets leaned it out and fried it. I think you're right, its screwed.

well i got the thing started tonight i had put some oil in the cylinders and let it sit and went and it fired up after a couple pulls. i am shure its going to need rings and pistons but the bottom end sounds ok. no bad noises