Champion CJ8 spark plug is for the crsftsman 3.0 edger/trimmer
follow the thick black wire from under the fly wheel cover it goes to the spark plug
0.020 in or 0.50mm
on most trimmers the gap is about 25 thousands !!
Champion RCJ-6Y ... per the Manual.
If it's the metal bar near the spark plug that you push towards the plug to kill it, all it does is ground out the plug, making it not spark. That bar is connected to the frame of the mower ie grounded which in turn grounds out the plug and wire
RJ19LM Champion
spark plug is good but when its plug in to coil on spark
.030"
.030"
It is likely a problem with the carburetor if a lawn edger won't start. It may have clogs which are preventing the spark at the plug.
0.020"
anywhere between 16 and 18 on a spark plug gauge should work fine.