Worst motorcycle movie?

Thanks to Netflix I just watched Girl on a Motorcycle. This is supposed to be a cult classic but I'm not sure why. The movie is just plain bad. Marianne Faithfull could take acting lessons from a bucket balanced on a broom handle. Her main talent seems to be staring at the camera with a stupid grin on her face while sitting on a motorcycle in front of a movie screen with the countryside moving by. I can only hope that she was stoned out of her mind as there is no other excuse I can think of. As a peek into the past it might have a certain interest for the archeologically minded but of cinematic values it is completely devoid.

Even Plan 9 from Outer Space is more interesting. No motorcycles but at least you know you're going in for the campy laughs and goofy fun. Buick hubcaps for flying saucers!?