Can't get it started

BillGrissom said

Try choking off the fuel supply and spraying starter fluid down the throat, which has ether which has a much wider flammability limits. Gas is more touchy and needs the carb to supply a fairly accurate O/F ratio to ignite. I assume it sparks as you crank.

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This is good. it will rule out electrical and timing/compression if the engine fires. In other words, this is what I do all the time, you don't neeed tools or take things apart just spray down the carb and see what happens LOL. But not too much, it will flood/load up. Quick troubleshooting is what it is. If no BOOM! you know its bad spark, even bad compression/timing is going to pop out the carb/exhaust. :)