SOHC.co.uk Forums > CB500/550

Cam shaft and rocker arm wear?

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alexdecker:
Hey

Took apart my top end today. Noticed some irregularities in the surface on the lobes and rocker arms. Attached some pictures. What are the standards for this? Still good? Not all of the wear can be felt with my fingers or nails - only some of it.

If not, do people usually get these fixed, or just buy new ones?

- Alex

Bryanj:
What exact bike is this, early 500/550 cam covers can wear the rocker spindle holes oval allowing odd wear patterns.
Difficult to tell wear by pictures but if feelable wear you need different parts

alexdecker:
This is from a 1978 CB550F. The wear is feel-able on some if the lobes and rocker arms…

- Alex

Bryanj:
That should have the later cover with locked shafts which probably means lack of oil changes or wrong oil used.
Cams and rockers from any 500/550 are the same and earlier, unpined, covers will fit complete or provide internal parts.
You can get reprofiled cams but mostly from the states. Usually lots of used parts on fleabay.

Oddjob:
Although the shafts can be locked, and yours are as I can see the pins, the shafts themselves can wear, especially if the oil isn't changed regularly. Pull the shafts and see what they look like. Be aware though that if they are worn they are very difficult to find and expensive when you do so. Get the cam reprofiled, might as well have a better profile while your at it, add 5 degrees of overlap and 10 degrees of duration. Get the rocker arms done at the same time or find good ones on Ebay.

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