[Masteryota]

The only thing you haven't ruled out is air. Although unlikely, you may have a plugged muffler or clogged air filter, pop either one of those off and see what happens. You have good compression, you have constant spark, you have tried alternative fuel sources, the only thing left is air. I do feel I need to ask, what color is the spark? It should be a nice thick blue arc with a *snap* sound, yellow spark won't perform well under compression.