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Teds new project a CB500 K1 mostly version 0.5 circa 1972.
Oddjob:
Personally I've yet to find a 500 that doesn't have 8 fitted from the factory, my engine number is WAY past what Honda claim to be the cutoff point and that had 8 as standard. The K2 parts book for instance shows them still be fitted and by the time that came out it should have changed over to the 4 shafts only, so why show the 8?
Trigger:
It changed from 8 shafts to 4 shafts in the UK for the CB500 K1 in 1974 ;)
Seabeowner:
Parts manuals seem all over the place about the number of shafts.
in Aladdin's Cave the Japanese CB500 K0 parts list only shows 4 shafts.
+ the CB500 K0 K1 list dated Jan 30, 1972 also only shows 4 shafts.
+ I have a parts list (downloaded from honda4fun I think) that is supposed to cover K0 K1 K2 as Page 4 pictorially showing both 4 and 8 shafts. 4 shafts to 2006337 and 8 shafts from 2006338. (or maybe this is a mistake and should be the other way round)
None of these had the later 4 pinned shafts fitted to later 550s. SB08 11/08/76 covered this. It seems strange that Honda did not fit this mod for a full five years after 500s were first sold. Or for some reason did it only become apparent on later 550s.
Trigger:
Four shafts were fitted to the CB500K1 in the UK from the middle of 1974 and all 1975 ones had them fitted. ;)
Oddjob:
I think people read the parts book wrong, says 4 shafts UP TO 2006337, 8 shafts AFTER that number. Must admit to doing that myself. My 05/71 parts book only shows 4 shafts, no picture or mention of 8 shafts.
When they changed back to 4 shafts again much later in the production run they weren't staked like the 550 ones, the 500K3 were staked as that's using a 550 style rocker box
https://www.ebay.co.uk/p/1511829976
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