Hey. Not sure what made me think of this after like 10 years but back in the original Polini cup days, Creatures (and 1977?) had a Puch with a variator on it. They kept the details secret at the time cause of racing, etc... but now a decade later, I'm curious how it was done. I think I remember reading something that said that they used a Puch crank from a diff bike?
That pic is the correct race but might be the wrong bike... I didn't get a great pic I can be sure is it... and couldn't find the thread on here.