it's amazing what actors will do for money instead of work a 40 hour - clock punching - lunch box job

the really stupid shit doesn't get started until around 40 minutes in, and the motorcycle racing starts at minute 52

Bud Ekins was the stunt coordinator
https://www.imdb.com/title/tt0069372/fullcredits?ref_=tt_cl_sm#cast
https://www.facebook.com/groups/stiffspeed/permalink/1598888096924467/

yes, from what I remember, movies really were that stinking bad. They sucked, and there wasn't much you could do about it... there was no HBO, no internet, no movie rentals... and there were not many channels on the old black and white tv you could afford.  People read a lot of books back then for a reason.