My spark plugs vibarate loose. I put them in finger tight, then wrench them a quarter turn. Threads stripped? Thought about heat resistant lock tight. Any ideas on the problem/solution? Thanks, zen

I use anti-seize when installing mine. I have never had them come loose.

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2004 FLHRI (Traded in with 40,500 miles)
2008 Vivid Black Ultra with ABS

Get some new ones, maybe the plug threads aren't cut right or the metal gasket/washer has been flattened. I would steer clear of thread locker, baaaaddddd news.

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EITHER GET A CLUE OR GET OUT OF THE F@#KING PASSING LANE!

Just a suggestion, but the price of a torque wrench is usually a lot cheaper than the trouble caused by not using one. If you get a torque wrench and you can't get 15 ftlbs on the spark plug ,because the plug keeps spinning around, it's time for a helicoil or something else to repair the hole. Just my 2 cents.

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Stu Cabral

Thanks for the suggestions. Yes, I will get a t-wrench, need it for everything else, anyway. I used the anti-friction compound, the plugs screwed in evenly. That was a problem before, they would bind and I would have to back them out a little, then screw them down, sometimes several times. Have not yet run her on the road, raining here.
Again, thanks all!
zen