Sandcast Carburetors, (4-Cable). Overall condition is great.  (B750A) Coating on carbs is like new, iridescent finish /sheen has the rainbow colors, floats are the same way.  Zinc finish on choke lever and linkage very good.  Float bowls,(small drain holes) three float bowls look new.  Carburetor springs have the spring seats, (I think that's what you call them) these are Very hard to find.  Main jets #140 and slow jets #40.  What's missing: three float pins , one float bowl drain screw and the 4 choke linkage 3 mm. cotter split pins.  Plating is poor on the 4 idle screws and the 4 float bowl retaining clips.   
$800. + shipping.  If you have questions or need pictures, let me know.

For sale, new in the box, early (Unstamped) Diecast cases, PN 11010-300-110 are the redesign cases to address the final drive bearing issue.  Per SB # 29 cases  replaced sand cast and early Diecast.  The case set I have (11353-300-405) is for the early Diecast cases.  The kit contains the case protector, bearing set ring and bearing.   This kit does not have the replacement oil pan and 10 hole clutch cover as needed for the Sand-cast engine.   $1,200 OBO.  Plus Shipping.  Let me know if you need additional pictures/info.

Reading this thread yesterday I was thinking if I saw any of these dots on my bikes I had in the 70's.  I'm now 68 and that was a long time ago.  Anyway I woke up this morning thinking about these dots and said I have dots on my K4.  Does this count?  Red dots on carbs.