little hole on cylinder head?? what for

4 replies to this topic
  • yamahasocal450

Posted September 11, 2003 - 07:00 PM


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 :)

  • foursmoke

Posted September 11, 2003 - 07:18 PM


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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  • yamahasocal450

Posted September 11, 2003 - 08:08 PM


ohhhh that makes perfect sense now thanks :)

  • GrahamO

Posted September 11, 2003 - 09:15 PM


That's how Bruce gets to Wayne Manor from the Spark Plug cave.

  • slr

Posted September 12, 2003 - 10:03 AM


i put my air nozzle in there to pop my spark plug cap off.


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