You said you have spark at the spark plug and there is gas in the carburetor, so the remaining causes for a dead cylinder are narrowed down to gas not getting into the cylinder or low compression.
Remove the offending spark plug, ground that plug wire, hold a white paper towel in the spark plug hole and see if gasoline gets on the paper when you start and run the engine. If you don't get gas on the towel, dump 4 ounces of ATF in the gas tank and top off the tank with gas. The ATF will help clean the jets in the carburetor and may clear up the problem. If no improvement after 100 miles, pull the carburetors and clean them. There are several threads in here on how to clean the carburetors and what to look for.
If you get gas on the towel, you are down to low compression as the culprit. You can order a compression gauge from Walmart online for around $20, probably higher in Alaska. If you don't want to buy a compression gauge, see if AutoZone or O’Reillys will lend you one; they do down here. The finger test says you have compression, but not how much, the gauge will tell you how much. All cylinders should register within 10-15% of each other and all should be over 100psi.