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  1. #1

    what's the correct spark plug gap for 1999 ultra 150?

    NGK's R6918C-9

    These are the stock plugs.

    Many thanks!


  2. #2
    According to the Service Manual 2-16:

    Spark Plug Gap
    Standard: 0.7 ∼ 0.8 mm (0.028 ∼ 0.031 in.)

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