SOHC.co.uk Forums > CB500/550

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

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simonster:
Under the cam chain cover of my mid-renovation '72 500 k1, I have what appears to be four absent 6mm bolts. I've heard some models don't use them to hold the rocker shafts but these are threaded down and clearly was intended to hold bolts about 50 mm length. I've had her running under nil load, so confused as to why they are absent and how it runs apparently fairly smooth on tickover!! Any suggestions would be greatly received?

Trigger:
These four bolts were added to stop the cam shaft springing/bouncing so much. You find these on later models and on the 550. Though a 550K1 doesn't have the bolts. 

simonster:
Cheers trigger, but why would this cover have the bolt modification without the actual bolts being in place... I take it they aren't essential on the later models either?

Trigger:
If it has the threads then someone may have forgot them.

mickwinf:
if I recall correctly the earlier type have the 4 screws inside the breather cover, according to my 500/4 parts book 6x32mm part number 95700 06032 and the later 550s have an extra 4 studs with nuts to stop the rocker shafts turning in their housing and wearing the holes oval. I am sure Bryan or Oddjob will tell you for sure.

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