Every YZ a I saw here in the US was silver and red. The YZ A models were sold here as 74 models. My uncle picked up a new YZ250A in late 73 or early 74. The 72 DT2 250 and RT2 360 were silver and red, the 73 MX 360 was silver /red while the 73 MX 250 was silver with yellow stripe. I had a 73 MX250 for a while. The first yellow bikes we saw here were the 74 MX models. The first yellow YZs we saw here were the 1975 B models with monoshock. My uncle had a YZ250A, YZ250 B and YZ250 C in this era. The YZ models in the Us continued to be Yellow until the 85 models -starting the wht red until 96, when the blue came in.
Still, that black and red color scheme is a knock out. I love it. BTW when most YZ A models started hitting the tracks again in the early 90s, most were re done in wht/red. We always wanted to make our US bound Yzs white and red like all the others in the world.