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.030" Champion RJ19LM or J19LM for manual, go to: http://www.disruptit.com/manuals/L0020135.pdf
GAP .030"
Champion J19LM
yes
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.
It depends on application, but .030-.035 inch would be average.
The gap setting for cj6y plug is.....027 From the maker of the plugs In Japan
J19lm
Champion J19LM or RJ19LM
torch GL4RC or Champion J19LM
Rj19lm
Most mowers are 30-35. Depends on the manufacturers