Cj8 is hotter than cj7
According to the Champion plug web site they are both bantam height. But a different bantam height. I ran into this and found that the plug looked different where the wire connected and sealed t the plug and that was the only difference.
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Champion Spark Plug Co. is currently owned by Federal-Mogul.
A sp-34 spark plug to a Champion plug is a small engine spark plug. They can be used for lawnmowers and weed eaters among other things.
This plug is the Champion RCJ7Y.
Champion RCJ6Y
Champion Spark Plug QC12YC
Champion J6C
The RC14YC in a hotter plug.
If you damaged a Champion RJ19HX spark plug, then you can indeed replace and substitute that with a Champion RJ19LM spark plug due to the similarity in their sizes.
ngk Bm6a its the same plug
GAP .030"