SOHC.co.uk Forums > CB500/550
CB550k1 US Import - UK registration
Trigger:
Looks like it has been blasted. A nice looking head is not always a good head ;)
Just looked through my records and the last 26 heads that i have worked on needed new valve guides, due to being worn or cracked .
Go back 15 years and you could always pick up a workable head. A lot have cracked valve guides and bent valves because of the rockers bending them when the owner forces on the rocker cover.
K2-K6:
Agree that surface on that one needs light skim too :-\ general gouging from, looks like, someone trying to clean off gasket especially around the tunnel for camchain.
Also the sealing rings around the cylinders has corrosion pits where the fire rings clamp to resist the compression of each cylinder that wouldn't give a reliable face for new gasket to work with. The one with blue zip tie looks the most credible, but others less so.
Assessment of both to see if valve guides are in tolerance would be initially a decent start point.
K2-K6:
Looking through the heads posted earlier, I felt this one was potentially the most honest from Looking at the photos only https://www.ebay.co.uk/itm/275635167268
Bearings and most threads look good, gasket needs cleanng off, combustion temps (colours of chamber) look quite good with #1 a bit rich.
Obviously, what's inside is not checked but looks like it's from a reasonably run engine.
Doesn't anyone sell those with their cam cover pair at all ?
Sesman:
One thing. If that head has been blasted I’d be carful to remove the camshaft bearing oil gallery bungs and make sure the gallery is squeaky clean. Trigger may may able to advise how these are removed and replaced?
juitz:
Thanks all, I'll take the head and cylinder block to get skimmed together.
Cylinder rings have some very slight pitting, can you machine these surfaces? Is there a spec I can point to?
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