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If the spark plug is stripped, replace it, if the hole in the cylinder head is stripped, the first thing to do is run a tap or thread chaser through the hole, if that does not work, you will need a helicoil http://en.wikipedia.org/wiki/Helicoil
yes but is is cost effective? that's your call
Repair kit availale at most auto parts stores
How easy is it to replace a spark plug wire on a gas weed eater?
Could be that the threads are stripped on the plug or the head where the plug is screwed in. Or maybe it's the wrong plug..
The spark plug for a Stihl FS36 is a Bosch WSR6F gapped at .025
Don't know much about lawnmowers but I work on cars. So either ur threads in the head are stripped and/or ur exhaust system is clogged, making the pressure come out of the weakest area which in your case is the spark plug hole
.025
.025
gap is .025
Champion CJ8Y
.025