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what were the numbers for the compression? 120 is ideal, but 110 will do.
after it idles for a while *cautiosly* feel the y-pipe right next to the exhaust port on the cylinder that isn't firing. If it isn't hot, It's not running on the cylinder.

if the compressoin is good, if the cylinder is GETTING gas into the combustion chamber, and if there's spark, there is no reason it shouldn't run.

when you cleaned the carbs, did you clean the pilot jets? just asking because some people don't know they exist.
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