What is a CR181? do you mean an RC181 the 500/4 Hailwood & Redman rode in the late 60's. I think I am right in saying Honda only built one and it no longer exists, an Hungarian built some replicas from photos, Honda refused to co-operate with drawings, using 550CBX engines as a base. I never heard it described as petite before, it was always described as a monster, in an attempt to tame it Hailwood had a frame built by a recognised British frame builder which improved it, this angered Honda who I think then took it off him about the time they pulled out of GP racing.