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The J19LM and QJ19LM are Champion brand spark plugs used for garden machinery. The difference between them is their resistors, the J19LM use a regular resistor while the QJ19LM uses a CDI resistor.
The Champion spark plug rj19lmc should be able to replace j19lm. Many of Champions spark plugs are interchangeable with plugs with the same letter coding.
J19lm
Throw any RJ2YXLE away that you come across and install a RJ19LM. Problem solved. I work for a company that sells briggs products and we have replaced, literally, hundreds of these this season. It's a horrible design. There are a few other plugs that will work as well, ( RJ19HX for example ) are more money, but you can rely on a good old RJ19LM to get the job done. Hope this helps.
B5s
Champion RER8YC
Champion
Champion RJ18YC6
The laser 40500 Champion cross reference is for spark plugs. There are many cross reference data bases to show which spark plugs can be interchangeable.
Champion rc12lcChampion rc12lc
Champion, which is what they were built with.Champion, which is what they were built with.
Spark plugs come in three sizes: 5/8, 3/4, and 13/16. I think the RJ19LM takes a 13/16 socket. However, it would be wise to have all three sizes of sockets in your tool box - you never know when you will need one or the other.