From the Banner is Up!:
[...] The last Big Bear Run was in 1960, and ran from Lucerne to Fawnskin and back to Lucerne. Eddie Mulder won that one on a 500 Royal Enfield thumper...
What that quote fails to mention is that one of the rear shocks was broken in two! Eddie was a crazy kid and he's a crazy old man. An inspiration to us all!
Thanks to peckhammer.