Last month Colin Mc commented on my post about Jim's new acquisition, the Honda S600. He tried to bring up photos of S600 roadsters that he's owned but it didn't work. Here's the pictures. Firstly an S600 with 2 litre Ford, then an original engined S600 but with S800 grille and finally an S600 with Datsun 1400cc power. Engine upgrades on the tiny S600 were common.
Here's a coupe that was on eBay in Sydney last week.
Of course, at the beginning of the 20th century, chain drive was commonplace.