What are these for?

[Frozt]

At the tip of the pin is what I'm asking about. Seems to be 2 per exhaust side and if I trace things correctly, there are 4 ports on the cylinder. Now, personally, that to me looks like a design flaw that would allow exhaust gases straight out without hitting the exhaust pipe.

[steves]

I think those are oil galleys. I can't remember. What makes you think it would let exhaust out? The head gasket is in the way.

[Frozt]

I think those are oil galleys. I can't remember. What makes you think it would let exhaust out? The head gasket is in the way.

If you pull up the manual for removing/replacing the head itself, you'll see that the head gasket has holes just for them, that let out into a port underneath the oil return.

From the manual itself with area's circled in red.

[steves]

If they had anything attached to them, they are part of the PAIR system, and allow unburt fuel vapors to be pulled back in through the intake.

There are also drains from the sparkplug galleys to allow oil/water to drain.

[Kreylyn]

Steve's right, those are the ports for the CA Emmisions 2nd air system. In the pic you posted, red circle... if the 2nd air was equipted on the bike, or the engine is from a bike that was equipted... then there would be 2 thread studs there, and the ports would be drilled out for excess fuel fumes to be pumped into the exhaust. If no studs, and the holes are not drilled all the way through on the lower case... then it's not equipted for that engine.

Krey