SOHC.co.uk Forums > CB750
Secrets of a CB750 early K
Trigger:
This is getting interesting. PN 12238-300-300 was fitted to the late K1 and on.
I have done two sandcast heads that have the oil jet in but, on the third one it looked like Pete's and RGP's. I assumed on the third head that the oil jet had blocked, been drilled out, welded and a hole had been drilled.
It is strange that some sandcast/diecast heads have this jet and some don't, all I can put this down to is Honda had two suppliers of early heads but, that doesn't make sense.
hairygit:
Or for whatever reason the bike had a replacement head fitted, either by a main dealer who would fit the later item, or by a previous owner who saw the later head looked similar and fitted okay, when it was just an "old" bike and nothing like as collectible as they are today! ::)
steff750:
;) hi guys here is my take on these oil jets.
my frame number 1017*** diecast has the simple drilling my frame number 1031*** has the big oil jets(filter underneath) i have yet to strip a k1.but I've cannibalized loads of k2s k4s k6s and f1s and f2s and they all have long thin ones like in the parts manuel :-*
AshimotoK0:
covered here too Hondaman may have a drawing
http://forums.sohc4.net/index.php/topic,154725.msg1770421.html#msg1770421
Here is mine.. Wonder what the PJ is?
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AshimotoK0:
Here is my mate in York's early '71 K1 head. Not a good photo (not taken by me Trigger ;D) Looks like O ring in the top of the oil jet.
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