Hi uhuh, dont know,but in the classic motorcycle mechanics issue 187 a guy doing a rebuild on a monkey bike a honda DAX which has the same engine as the step throughs, Quotes,I know the top ends are interchangeable between the 50 and 70,but not with the 90 which implies the 90s are different unquote,That was from the May2003 issue.You may be able to ask the chap, this is hes web address from the Magazine, [email protected], OK?
Tony
acm