I posted a few days ago 'bout my primary vent spewing oil on my '74 XLCH. I had posted that i thought i added too much oil in it. But thats not the case. Oil must be comin in from the crankcase through the seal @ the driveshaft (just guessin) Is that an easy fix? Just pull out the primary drive? No case splittin involved is there? Any input would be really appreciated.