Excuse my ignorance, but aside from a barrel (& piston) and matching crank, is that all this bike has that allows it to be called a Mugen? Is that no different to buying a stock commodore, bolting on some parts and calling it a HSV Clubsport?
Please correct me if I'm out of line, but is the bike not stock standard CR250 with a different top end, a late model Swingarm of unknown origin (owners description) and a set of period fox forks and shocks. Is it not misleading to advertise the bike as a Honda Mugen ME360 VMX 1979 when it's not?