Changing my oil today I noticed a hole on the side of the cylinder head on the kickstarter side of my bike. It is centered on the cylinder, about one inch above the head/cylinder junction. It looks exactly like the hole-with-ball (I don't know what it is called) up at the oil gallery bolt except there is no ball. I can stick a pick about three inches into the hole. Nothing comes out of the hole when the bike is running, no oil, pressure, or noise. It just looks like three inches would put you close to the middle of valve train. If it is supposed to be sealed, recommendations on what can be done would be appreciated.