Not Ranked
Fire up the engine and pull the plug wire from each of the offending plugs one at a time. Hold the plug boot next to the block and look for a spark to jump. Or you can just touch the end of the boot with your finger. (when you wake up, proceed to the next plug and see if there is a spark to it as well).
If there is spark to both plugs, and I bet there is, then you have a fuel delivery problem. Go back to the carbs. Could be the same problem to two separate carbs.
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Jim
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