Chainsaw Repair

Thanks for the reply.  I put the SAE 30 in the compartment labelled "Chain Oil" and TruFuel 50:1 in the compartment labelled "Fuel Mix".  With this setup, three years ago I had several successful cutting sessions until I needed a new chain, which I couldn't locate until now.  The 50:1 fuel was recommended by the guy at Home Depot, but he admitted that it was his best guess-the saw was manufactured well before he was born.  But his advice got the saw functioning quite well for several sessions.

What's next?  I read around about something called "de-carbonizing".  My only experience with that term was in the repair book for an MGB some years ago, they recommended taking out the spark plug of the suspect cylinder, dropping a ball bearing in there and running the car for a little bit to break up the carbon.  Don't think it works on single cylinder units, though.

What do I try now?