Problems after rebuild

I have a 2003 fz1 I recently rebuilt the transmission on. After completing the transmission, sealing up the cases, I was left with 1 part on the bench! It looks like a locating pin, except it's rather robust. It looks like a rolled and welded (like a hollow pin)ground pin. Thicker in wall thickness than all the others. Everything seems to be functional, so, I through the motor in the bike. It fired up, but sounds like something isn't getting the lubrication it needs. I will post a photo when I figure out how to, but, my question is, could this be a sleeve for an oil passage? Maybe to increase pressure? I can't find any builders that will touch this, and I don't know what to do. Thanks in advance
 
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