SOHC.co.uk Forums > CB500/550
CB500 K1 rocker cover woes
Seabeowner:
I think the pinned shafts were only introduced after about late 1975 or 1976. It seems that the problem only raised it's head after a long while. I have two rocker covers off K1s that came off engines that have over 50000 miles on them and both seem fine.
I have a later pinned set that shows wear on the shafts where the rockers rocks instead! No wear on the earlier non pinned shafts here.
Never seen anything like the pics above. Is it off a recent import bike?
Bryanj:
Pinned shafts came in the K3 and maybe 76 F
DomP:
--- Quote from: Bryanj on September 10, 2025, 08:45:51 PM ---Pinned shafts came in the K3 and maybe 76 F
--- End quote ---
My 76 F1 has pinned rocker shafts so that confirms that Bryan
Kai.chris:
The cover does indeed have the pinned shafts.
Bike was originally an import from Italy over 25 years ago.
Good to hear I don’t need a new cover, bike has already broken the bank several times over.
Kai.chris:
Rev counter worm drive bore is also riddled with pin holes.
It must have been very poor to begin with. It’s not corrosion and can’t be wear in those locations as others have pointed out.
Possibly trapped air during casting, known as gas porosity.
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