Never heard of this movie….

Saw it at an old shitty drive-in. 1976-77 maybe? 
It was pretty decent if my old memory is correct 

Same. Came across it just last night, undoubtedly from the same channel.

Well worth a watch if you do old school 70s movies.

Gary Davis & Eddie Mulder did a lot the riding for that movie. The actual bike was a 438cc 1977 Maico  that was in the AMA Hall Of Fame at one time.

See link https://www.mecum.com/lots/1105748/1977-maico-sidewinder/

The music, acting and production values remind me of the first porn movie I ever saw. Some late '70s bow chicka bow-bow flick. Only this one's about motocross!

Marjoe Gortner. They used to run this movie on my local WDCA CH 20 when I was a kid. We thought the Sidewinder was awesome. Dirt Bike Magazine had a cover feature on it.

Another good one was CC and Company with Joe Namath. The scene where he goes out in the MX race on his chopper is classic.  Ann-Margret.

Sidewinder is a good one but the best is "Little Fauss and Big Halsy".