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Well, about two weeks ago, I poured marvel mystery oil into both plug holes and filled them up. Then I poured some into the carb and filled the crankcase the best I could. It has been sitting with the plugs down for about a week and a half and still won't turn. Today, I turned it on its flywheel hoping to get the oil on to every crevice of the cylinder. If I don't get results soon I'll pull the head like whalerman suggests.
i'm not sure putting it down the carb is a good idea. You have jets that regulate the fuel, much thinner then oil, that you need to clear to get fuel. Putting it down the spark plug hole is fine. But if your turning the flywheel, your half way there, come carb cleaner to clear the jets, and see what you have.
When using any kind of penetrating oil, don't forget about setting up a vibration by tapping in different areas to allow the oil to penetrate further than it would by time or gravity alone.
Duf, the marvel oil is getting no where near the jets. I open the throttle valve and let it pour in. I was extremely careful in getting it by the reed valves down into the crankcase.
