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Engine won't start? The typical flow through is:
1. Check spark. (typically hold the end of the plug against the engine chassis with the boot so you don't electrocute yourself and kick it over. If you see a spark, ignition is good.)
2. Check fuel. (Spray starter fluid into the carburetor air intake while trying to start).
3. Check compression. You can find cheapo compression testers at Harbor Freight, and probably places like AutoZone.
Unfortunately, the most likely scenario is that you were running too lean, causing engine knock (the pinging sound), and hammering the entire piston assembly/crankshaft/crank bearings until something or things failed. You didn't say if it was a 2-stroke or 4-stroke engine; failure of the crank case/crank shaft seals or reed valve in a 2-stroke (because the rings had a complete failure and allowed explosive pressure into the crank case) would mean that you get no fuel into the combustion chamber, and the old top end wouldn't mean much without fixing the damaged parts.
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