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Engine & Maintenance

Valve Clearance Calculator

Shim-under-bucket math: new shim = old shim + (measured − spec). Too tight needs a thinner shim; too loose needs a thicker one.

Inputs
Results
Live

  • Clearance

    In spec

  • Suggested shim

    1.85mm

  • Shim change

    -0.0mm

  • Mid-spec target

    0.125mm

  • Current clearance

    0.12mm

Formula

new shim = old shim + (measured − desired)

Confirm the bike uses shim-under-bucket. Some Hondas pad the bucket differently — always match the manual.

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