just the right mixture?

[Jason W.]

How can I tell if I have the mixture just right?

I read about getting the temp. just right, but I dont have one of those
high tech temp gauge, so I trying to do it by jugdement.. I'm guessing
that I'm still a little rich, due to the fact that I'm getting a oily
residue on the pipe side of the body and the left rear tire..

Any suggestion?

Jason