kawasaki f1 was made till 71 or so i believe. probably the very last of the press frame 1st generation japanese bikes... suzuki made some press frames into 71 or so i think - but they were 50cc (as50)
there are tons of italian and spanish and czech singles street bikes 175/250
i would think the geography of 'merica kinda dictated the low offerings of small single street bikes in the us..
07 gasgas xc300-94 duc 900ss-86 morini camel (2)-84 IT200-83 IT175-78 guzzi lm1-77 pursang 250-76 morini 3 1/2 strada-76 frankentaco pursang 200-74 frankentaco pursang 200-74 morini 3 1/2 sport-74 mz ts250/0-74 puch 175 (3)-73 can-am 175tnt-71 guzzi frankeneldo-71 ossa Stiletto-70 frankentaco sherpa s(2)-66 morini corsarino(2)-63 morini corsaro + many more