Still a man who greets you with a two-handed handshake, he humbly downplays his cult-status with the locals as "better than I deserve".
His undiminished love of the sport and positive outlook is all the more admirable given the cruel twist which ended his career and changed his life.
The season of his third Marlboro title 1976-77 Hennen was the first American to win a 500cc Grand Prix motorcycle road race in the 1976 Finnish Grand Prix.
A leading contender for the world championship, two years later at the Isle of Man TT he had just become the first man to ever complete a sub-twenty minute TT lap when he hit a curb at over 241km/h.
The crash left him with severe head injuries, from which he recovered over time but the lasting effects forced his retirement from racing.
It would prove only to strengthen his faith.
"The fun part is if I had died when I was involved with my accident, I'd be in Hell now," Hennen says.
"Now I'm Christian, and life is beautiful."
Hennen was inducted into the AMA Motorcycle Hall of Fame in 2007.