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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.

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10y ago

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The RJ19LM has an added resistor to reduce radio interference. You can use either model for your application as they are interchangeable.

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12y ago
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QJ19LM uses a CDI resistor, while RJ19LM uses a regular resistor.

SOURCE: Champion website

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12y ago
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Q: What is the difference between an RJ19LM and J19LM plug?
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