You need 3 things to run. Gas, air, and spark. One of the three is a given. You have a fat blue spark so we might have eliminated a second. So you likely have a gas issue. If you hae compression you have the basic pump necesary to move the diaphragm in the carb. If the carb has ever been removed it's possible the pulse port has been blocked by an inaccurate positioning of the carb gasket. For a basic, sure to get it started needle setting, set both needles to 1-1/2 turns open from full closed. Watch the fuel line when you flip the prop with the choke closed and the idle trim on the transmitter about 3/4 up. Throttle stick back.

If the fuel is moving you have a working pump. If the engine has sat for awhile the carb pump diaphragm may have dried out. Take the carb apart and get everything inside wet with gas and put it back together. If the diaphragm with the little flap on it has the flap sort of bent out of a flat shape, it needs replaced. If the engine starts let it warm up some then start adjusting the needles for peak performance.