Peter Fonda -- Screw the Purists ... I'm Gonna Ride Electric Harley Cross-Country

Harley-Davidson's new electric motorcycle just got a thumbs up from one of their most famous hog hounds ... Peter Fonda -- who says he's planning to ride one coast-to-coast.

Peter raved about the bike and then gave us tips on how to ride a chopper across the country ... which states are the best and where to stay.

Peter's a big movie star, but he's not a Four Seasons kind of guy.