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zx-9r spark plugs

  1. ZX-9r NGK spark plugs

    ZX-9r NGK spark plugs

    Comparison: Replacement set used for Winter riding with 11,000 miles on them (top) and the original set of plugs now with 36,000 miles on them (bottom). All four appear to be running ideally, maybe a little rich somehow on #1. The other mods that reflect the plug color readings are the K&N ai
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