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Not shutting off with the throttle barrel fully closed was not considered a defect for many, many years. Like you said, you just learned to live with it. There were several engines, very popular ones, that were made in the past that had this affliction, but darned if I can remember them at the moment.

Plugging the vent, putting your finger over the carb (sometimes), or pulling the fuel line was quite common with such engines. I used to grab the spinner (very carefully) and stop them that way. I no longer recommend that strategy. No, I never got bitten from doing that, but that was just pure luck.

Lots of engines have a spiral groove ground in the crankshaft. That was put there to pump escaping oil back into the crankcase. Sometimes, if this spiral comes back too far, this will cause the engine not to stop even when your finger is plugging the carb intake hole.

Engines that do not have this groove, but are still experiencing not stopping at barrel closure can have a worn crankcase crankshaft bore.

I'm not saying that things cannot be influenced by using sealed bearings once a situation exists. I am saying that I don't know of any manufacturer that is relying on sealed bearings to seal this area of a TWO-STROKE engine. Of course, the world changes and there are lots of things that I do not know. <G>

Ed Cregger