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I vote for water in the fuel.
Whenever they (1800S's mostly) have good spark, timing, point gap, what appears to be fuel, and gosh, there's plenty of air out here, it usually turns out to be: water got in the tank somehow.
Take the main fuel line off your float bowl and put the end in a glass jar, crank the engine a couple times to spurt some gas in there, let the jar sit for a few minutes. If there's water, you'll see seperation, the fuel floating on top...couldn't hurt.
I've had older plugs that got so wet (with fuel) they never would fire again.
Best,
Shayne.
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