When you get the new cases, check the bearing stamps against your existing one. You may well find that several of your existing crank bearings will still fit, as the grand majority of the cases came in "A" or "B" sizes in the K4-5 era. The cranks generally varied little. Keep in mind also: there is only 2 ten-thousandths inch difference between bearing shell sizes, and 8 ten-thousandths for the entire range: most shade-tree SOHC4 engine builders can tell you that for a general-purpose, commute-to-work engine, even making the mistake of a Black bearing on a Yellow crank will still work. It will, however, be somewhat cold-blooded for the first couple minutes. If you go the opposite direction, like a [very rare] minimum crank bearing with a Yellow (largest dimension) bearing shell, running 20w40 or 20w50 oil will keep it happy for many tens of thousands of miles.
The spec clearance wear-out point is 0.0032", which corresponds to the Yellow bearing shell on a Black crank bearing with about 40k miles on it. The spec bearing "too tight" scenario is 0.0004", which is impossible to obtain with any of the cranks and bearing combinations we have: it will always be looser than this number.
So, not to worry, Honda helped you out long ago.
