Addendum: SOLD ON BILL OF SALE ONLY
This is a 250 Ducati Diana engine fitted in a Champion hard tail frame. This was the ideal setup for doing short track. Many liked the constant contact that a hard tail frame still gave you. Until the late '60s, these small Ducati engines reigned supreme on dirt tracks. The Diana series were the top of the 250 series with bigger ports and higher compression. Note the bolt on axle holders which allow further adjustment.