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Toro 2 cycle snowblower started back firing this morning?

I have a 20 yr old paddle type 2 cycle Toro snowblower that has worked great since I bought it. It started to backfire this morning. What should I look for? What are possible causes? I would like to repair it.
RicharGerten@sbcglobal.net, February 2008
first thing to check is water in the fuel tank, next i would replace spark plug and check for spark

robert r, February 2008