SOHC.co.uk Forums > CB500/550

Spot what is missing from the rocker hood and why??

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Trigger:
Mick, They are not studs. The 550 has 4, 6x32 flanged bolts. But, you will have to ask one of the old boys the reason behind them. I am too young to know ;)

mickwinf:
trig I have just had a look at my 550k3 parts book and you are right about the flanged bolt, looks like they changed from the earlier panhead screws, but also show 4 cotter pins to hold the rocker shafts with a nut on the top which is the ones I remember, so there will be 8 holes inside the breather area instead of 4, can just be seen on the pic in the parts book.

andy_c101:
See Service Bulletin #8.
Shows the addition of the 'cotter-pin' type retainers to prevent the rocker shafts rotating (on later rmodels)
Yes the four holes you show in your rocker cover photo are for four flanged retaining bolts, to attache to the cylinderhead;
later models as per the service bulletin introduce four more holes for the rockershaft retainers.
You do need to have bolts in your four holes on your rocker cover.

regards
Andy

LesterPiglet:
If the holes are there something needs to fill them.
The missus tells me that and she isn't even an engineer.

simonster:
Thanks for all the comments and advice. They do take 6mm bolts however one has been cross threaded in the past....but this doesn't explain why all four are missing!! I will tap out the thread and refit...cheers guys

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