Fuel in the throat of the carb could also be from float level being too high. That would certainly contribute to the engine being prone to flooding. Gummy carbs can take quite a while to get cleaned up. I am still fighting carburation problems on a used motorcycle I purchased and have have had the carb off too many times already. What does your spark plug look like? (I'm asking general questions and stating what may seem like obvious things to check as not everyone on the forums has the same levels of experience) The guy who used to work on our utv's and quads likes to set valves a little loose, as he feels that helps with easy starting. I like them set to the tight side of specs, as I find it helps the responsiveness of the engine. I used to set the valves on my mini-trail 70 engine to 0.0000" hot. Back in college, that was for a time my only set of wheels. I would run that little motor at about 10,000 rpms for hours-thousands of miles with no valve issues. But if the exhaust valve does not close all the way, or does not spend enough time on the seat, it can overheat, or can prevent the engine from developing full compression. Have you tried adding a bit of oil through the spark plug and cranking a bit to coat rings before the compression test? If the readings come up dramatically, that is a sign of bad rings.

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