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If you have an air compressor I would like to suggest a leak down test. This can help narrow down a few possibilities very quickly, such as excessive ring blow by. With the engine on the compression stroke and both valves closed, feed air into the cylinder and look/feel/listen for escaping air. If you get a strong steady flow of air from the crankcrase breather port, then that will tell you all you need to know about the ring seal.
Or an even simpler cold compression test might be all it takes.
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