The "C" model from 1972 has already improved a lot, with the new bore/stroke of 44x41 mm instead of the old standard bike 43x43 layout. The gearbox is now 6-speed, Watercooling is added, a dry clutch, VM28SC carburetors and a double twin leading shoe front brake made it a very good bike.

Yamaha YZ623C, 125 ccm 1972