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IMO, a spray can of starting fluid is by far the easiest way to rule out fuel. I don't think you'd have to even bother disconnecting the fuel line; just pop off the air filters, spray some of that magic stuff in there and crank. It's super flammable stuff, so much so that I think it would "overpower" the non-flammability of whatever is coming up your fuel line.
Also- you say you've only tangentially checked spark via the timing light. At some point (now?) you may as well actually check for a physical spark @ the plug, no?
good luck.
v.
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