Back in 1995, I talked to a guy sitting on a Vincent Black Shadow and eating ice creme at a gas station. He was retired and rode his Vincent around North America. 3 months later I read about him in Cycle World for having 150,000 miles on a Vincent.
I had 50,000 on a 1991 750 Katana.
I think 4 stroke singles are pushing their luck beyond 15-20,000, especially when flogged like a dirt bike.
