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yamahasocal450

little hole on cylinder head?? what for

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ok ive noticed for some time and all but whats the little hole about 4 mm in diameter on the right side of the cyilnder head (right side of the bike) just curious why its there :)

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It's for drainage of the spark plug well. If any water gets in the well from water crossings or washing the bike it will dain out there. I will also flush it with wd40 and compressed air before removing the plug.

Smoke :)

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