After sitting with gas in slead for summer,having problems this year. Found one cylinder not fireing and plug dry. Removed both carburators and cleaned all jetts and parts as best as I could. Now find both cylinders fireing but the one that worked before is runnig very hot,and engine will rev ok on the stand but not on ground. Have never played with carb adjustments so should be ok. Sled is a 1979 Eltre 5000 free air. Please help with any ideas.