I had a YDS2 in about middle sixties, a great little bike. I remember in winter time living at Villawood [not really that cold] I would start it up and being late as usual I had to walk it down my driveway straddling the seat till I got out on the road because with the cast iron barrels, until it was warmed up a bit it stalled when put into gear. But all good fun then! cheers pancho.