SOHC.co.uk Forums > CB500/550

CB500 K1 rocker cover woes

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Kai.chris:
Just started to clean up my rocker cover. Noticed inside the bores that hold the rocker pins looks like Swiss cheese in a few places.
Is the cover scrap?

McCabe-Thiele (Ted):
Looks like lack of oil has done that damage I'm no expert, my Dad used to call it bearing pick up.

Kai.chris:
Thanks for your reply.
I was thinking the same, or it was a poor quality casting to begin with.
Just spent 4 hours polishing the top of the bloody thing as well  ;D :'(

Bryanj:
If they are still circular and rocker shafts fit snugly theywill be ok to run, probably standing corrosion and only a small percentage of bearing area

Murf:
The rocker shafts are not supposed to revolve in their housings so were not designed to have lubrication, the rockers move on the shafts.  Unfortunately on the early bikes K0 K1, the shafts were prone to revolving causing the housings to become oval. Which basically ****** the rocker box. I had 3 shafts in my rocker box with loads of up and down play, so replaced it with the later rocker box with the pinned shafts.
The castings in your rocker box look really poor and maybe this is why some have worn badly. However as Bryanj has said if the bores are not oval and the shafts still fit well it’s ok.

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