@jncspyder posted:
I've owned numerous air-cooled motorcycles and none of them leaked at the engine cases. So I'm a bit surprised that the VW cases leak. I use Yamabond exclusively to seal vertically split cases whenever I'm rebuilding an air-cooled motor and it's never failed me. That stuff is tenacious!
Reportedly the motor was built by Pat Downs, but it appears he doesn't use Yamabond. The residue around the case joint suggests Pat used Gasgacinch, which is good stuff but not the best for this application in my mind.
Jason