HEY,I have a 1976 sportster.I seem to be getting small air bubbles in my oil tank,it looks like it's happening from the return line at the top of the tank.I assume that this is not normal,does anyone have any info on this subject????????

Actually, it is completely normal.
The scavenge(return, if you like) gears on the pump are larger than the feeds gears(as in wider).
This is to prevent any excess oil build up in the sump.
So, naturally, there is some air in the return.

Hey thanks for the info DynaRider,I was'nt sure if this was a normal thing or not as this is the first Harley I've owned. Thanks for the help