SOURCE: I need the spark plug gap for a MTD mower model #
The proper gap is ..030" Here is the Briggs application chart for L-Head engines like yours.
http://www.manddsmallengine.com/briggs/info/plug7.html
SOURCE: I am replacing the spark
I'm guessing you have a standard Champion J19LM plug, which has a gap of .030. They come pre-gapped from the mfg. and usually no need to adjust them. Most of the plugs on these engines have a .030 gap. There are very few exceptions that use a .020 gap (such as the RC12YC). Anyway, here's a link to a chart I like to use for reference: (there's a drop down menu at the top to change engines, but the standard Briggs engine is the one here).
http://www.manddsmallengine.com/briggs/info/plug7.html
Hope this helps. James
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