SOHC.co.uk Forums > CB500/550

CB550K - engine rebuild (partial or full)

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robvangulik:

--- Quote from: Trigger on February 22, 2021, 07:05:27 PM ---
--- Quote from: deltarider on February 22, 2021, 12:19:58 PM ---Erny, your finding doesn't surprise me. On the German site camchains are often found not worn.

--- End quote ---

The Germans must ride about like Old men.


--- End quote ---
You are aware that Germany is the only land in Europe, if not the world, where still are roads where it is legally possible to ride full throttle?
And I know from experience that most German bikers aren't afraid to do so.... :)

K2-K6:
I understood the thread focus was to assess if the motor needs to be split at this time to replace chains etc. Rather than avoid cost,  but more for Erny to get realistic appraisal of if and when it would be sensible to carry that out.

Obviously, the problem with the rocker shaft and it's effect on running brings that to urgent scheduling, but cam chain is ok and primary serms medium worn and so not absolutely required immediately if may be better to complete next winter.

As already noted through the thread,  camchain replacement is entirely sensible whether bad or not, if the crankshaft is coming out.

Clearly the two chains wear at very different rates,  but then they are completely different engineering solutions compared to each other.

deltarider:

--- Quote from: Oddjob on February 22, 2021, 07:44:47 PM ---TBH DR I don't think a lot of chains are worn, it's more to do with economy, whilst the engine is down it's false economy NOT to change the chain.

--- End quote ---
I agree. I just said that Erny's finding didn't surprise me, having seen the findings on the German site. I didn't suggest not to replace it, once the engine is open. I'd do it and every mec in the trade does, even when the chain is not worn. What I'm afraid of is that readers will open up engines for the wrong reason. Actually the best video's I've seen about rebuilding CB's are by Germans. Very thorough (gründlich), very detailed.
Riding like old men? The Germans? You must be joking. It's the only country on the planet, where they have no national speed limit*. At 140 km/h one can hardly keep up with... local traffic.
*Which is a shame actually. Friends in Germany have informed me that this is because of a strong lobby by carmakers like M-B and BMW.

Erny:
Just coming from garage, cam is out, next findings for your kind feedback, please - cam bearings in head.
Collateral info - bearings in valve cover are perfect, cam does not show wear on bearings.
From my point of view they do not look very good, hoping you will say it is normal wear (17k miles?)
All 4 bearings on pictures here

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Bryanj:
Aint just normal, they look in very good order

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