Still not sure if you have a good spark, or not from your post. Do you have a good, blue, zappy spark? A weak yellow spark is NO GOOD! Take a look at your points/condenser. The point gap has to be right on the money. Too tight, or too loose = weak spark. If your gap is right, watch your points while cranking your engine, if you see arcing across the points when they open, means bad condenser, which robs you of good spark.
Since your already into the ignition, I recommend working thru that until your sure you have a good blue spark. Once your sure your spark is good, I recommend just pulling the drain plug on the bottom of your carb and letting the gas run into a bucket for a couple minutes, not a couple seconds, a couple minutes. The gas flow should really run out in a full, solid stream. One guy on this site says it should run " like a cow peeing on a flat rock" That's a great analogy! If the fuel flow slows, gulps, or does anything other than running out at a full steady stream, you have either a tank venting problem, or a clogged fuel line/strainer. The carb. itself is pretty bullet proof. If it runs fine at idle, but dies under load, I would not immediately suspect a carb problem, but a spark problem, fuel flow problem, or power mix screw adjustment. Maybe try adjusting the power screw on the carb (the big mixture screw) according to the manual.
If that STILL doesn't fix your problem, check your engine timing. That's all free troubleshooting to keep you from throwing money into parts that may not be necessary. hope that helps
George
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