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Secrets of a CB750 early K

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UK Pete:
Yes i have checked now and all 3 of my 69 heads are like that, so with yours being the same as mine rich, and also a 69 head i think we can safely say 69 heads were much more primitive and have a simple hole drilled for oil feed, i have also read this somewhere but i am off out now so cant research it for a while
pete

hairygit:
In some places they are referred to as "oil restricters" so with Honda's policy of continuous improvement maybe the very early heads without them fitted caused problems of some sort?

AshimotoK0:
Well got home and my camera is behaving like Triggers

But it looks the same as Rich, Pete's etc.  Mine is 10/69 no insert just angled drilling in a round recess. Maybe my mate Chris's early K1 will reveal something. You would have thought they would have fitted some sort of insert though but the bike was rushed into production by Mr. Honda. Put a strong magnet near to my holes and definitely no steel insert fitted.

Or perhaps someone has fitted the top off a pepper pot from a dollies tea set  or watering can :)

AshimotoK0:
The plot thickens  Could it be PN 12238-300-300
 The dollies watering can/pepper pot head  :)


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SANDCAST 4/69 MANUAL NO MENTION OF OIL JETS

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hairygit:
That could well be the case, as very early motors had NO stem seal on the exhaust valve guides.
 :o

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