HOLE IN MY HEAD

[SEPTIKANGEL]

Not mine, but my son's bike, 2004 FZS1000 (he'll be along soon am sure) 
Small hole that sits between the two cap head nuts to #1 cylinder outer casting.
What's it for and why does it leak an oily fluid?

  FZS1000 HOLE IN HEAD.jpg (Size: 180.11 KB / Downloads: 43)

[RMT1983]

Drain hole to make sure water doesn't sit in with the plug and coil....