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When you have that kind of thing happen, you have to be extremely careful putting a new plug back in.
Now here's something to remember: At 10:1 compression, you don't have a TON of pressure on that plug. So unless the threads were totally shot to begin with, it would only pop out because it was loose.
Hope that's the case.
The reason I say you have to be extremely careful is because you MUST must must expect to contend with crappy deposits from the combustion process fouling the threads of the spark plug hole. They will be enough to make it jump or cross threads if you aren't careful. For that reason, you might want to clean the threads out with a small wire brush or something before you try to re-insert the plug.
Also, I'd say oil the threads on one of the old plugs (not the one that popped out) and run it SLOWLY in the hole. Feel resistance? Stop, back it out, clean it off, and go a little farther next time. And do it until the plug is down in the head properly. You'll be able to easily feel if the threads are hosed if you're turning it with the help of oil, and your bare hands on the socket or the extension. Or a stubby wrench, but don't use a full handled one. This is where you can make or break the threads if they're marginal.
Then clean the plug hole from the oil and put antiseize on the plugs.
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Chris Herbst, in Wisconsin.
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