Several years back, I purchased for my then still young #1 son, a K&S bike motor.
It was a gas powered by 1/4c fuel tank, and used the principle of friction.
He reached behind his seat, flipped a lever which released a spring, and it lowered the motor unit and it's ribbed metal roller against the top surface of his back tire.
I seem to recall it achieved 30mph on Kansas country-dirt roads. One thing it wasn't was "quiet." LOL
Interesting thread. Thanks to the one who shared the URL!
MeganRose
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