I picked up a EVO chopper that had been sitting for a few years. It has Delkon cases "both motor and tranny". The EVO is a head breather but the cases also vent. Installed a new JIM"S
oil pump thinking it might help with no luck. . Started searching and found a post from HDFACTORYCERTIF 02-16-2006 12:16 AM. Good info that cleared up allot concerning the DELKRON cases.