Clutch Issue

[Seabeowner]

How do you know yours is a 323 part?

It's item #10 on p.20 in the parts list CB500K2 (ED, F, G): http://www.honda4fun.com/pdf_parts_list/pdf_spac500/CB500-76/CB500-76_2.pdf
My bike was first registered feb 1977.

Yes we only got K1s I think. So not all K2s are the same as later Euro 500s carried on longer and got the new part.
Just to add to the mix I have a 500 Honda owners handbook marked K2 that has a 550 clutch shown. It's not the for the later (4000) Euro 500s as it shows original 4 in line idiot lights etc. Probably a very limited no.

[deltarider]

[...] Just to add to the mix I have a 500 Honda owners handbook marked K2 that has a 550 clutch shown. It's not the for the later (4000) Euro 500s as it shows original 4 in line idiot lights etc. Probably a very limited no.

I know what Owner's Manual you are referring to. It has two odd errors. The clutch shown in p. 72 was not on any CB500K2 and neither was the blow-by breather element shown on p. 66. Very strange. Probably due to copy and paste from a CB550K2 Owner's Manual. http://www.honda4fun.com/pdf_libretti/500/CB500_75/libretto500_2.pdf