Re: K case I.D. no casting numbers

[foot_doctor]

It’s pretty simple to tell the differance between the MK15 and MK20 cases. The MK20 was equipped with the larger, high speed SJ7173 roller bearing. The Mk15 used the full complement Torrington drawn-cup needle. In addition they both had the same size carb opening, but you should be able to discern the outward appearance of the MK20 case by the flat almost rectangles cast on the exterior of the bottom crank throw areas