Model #917385340 CRAFTSMAN Walk Behind Lawnmower, Gas

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Question and Answers


What is the size and type of spark plug that goes in my lawnmower?


The recommended spark plug was a Champion RJ19LM or J19LM. You can get more specifics about the plugs at but basically the two should be the same only the RJ will have a resistor to prevent radio interference.

Both plugs are still available and you can order either direct from Sear PartsDirect site. Go to and select PARTS or go directly to and then do a part search using the part number RJ19LM or J19LM.

You can also order the plugs through your Sears Store and they should be available through any Champion Plugs dealer.

The Champion website should have cross-reference information to match either plug to comparable ones from other brands or you can use the RJ19LM or J19LM numbers on other manufacturer’s cross-over charts.

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HVAC & Fireplace Bucket -
Sears Technician
April 10, 2008

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