My cousin and I got his Citiation SS out and the track wouldnt turn at all. I didnt think the clutch was engaging all the way. Finally it just started to go. Now when we get it to snow it hardly moves even if I have the throttle wide open. It goes good on a lightly cover road or diveway. We put new gas in and cleaned the carbs. Plugs seem to have good spark. I was thinking maybe a clutch adjustment, but I dont know how to do it. Any ideas.

crankcase seal?

plugs can look good and spark but when under compression they misfire. i would try some new plugs before i started tearing things apart.