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Spark Plug Gap Calculator

Convert plug gap between millimeters and inches, and compare against typical 2-stroke and 4-stroke dirt bike ranges.

Inputs
Results
Live

  • Gap

    0.7mm

  • Gap

    0.028in

  • Gap

    27.6thou

  • Typical 4-stroke range

    0.70–0.90 mm

  • Vs typical range

    In typical range

Formula

1 inch = 25.4 mm · 0.028 in ≈ 0.70 mm

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