I like to use a plug maybe 3 times and replace it due to the crush washer flattens out. If you use a new plug and are doing a jet run I put anti seize on the threads and only seat the plug lightly and when done doing jet tests I seat the plug and only use a short ratchet to snug it down. The head on my wifes 183c buggy is on the verge of stripping out so I put a new plug in it last spring and am leaving it till its time for a new head.
It is a good idea to let the motor to cool off for 20 minuets or longer before removing the plug.
As for time serts they work but aren't a guarantee but they do work.
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