SOHC.co.uk Forums > CB500/550
CB550K - engine rebuild (partial or full)
Erny:
--- Quote from: K2-K6 on February 19, 2021, 09:22:57 AM ---
Initial rough check of camchain;- just try to lift the chain at the highest point on the cam sprocket as it compares the chain pitch with the tooth pitch. Any more than approximately 1mm and it's worn to excess. Meaning that a new one cannot ordinarily be lifted, 1mm and you'd consider planned replacement, 3 to 4mm definitely finished.
--- End quote ---
Checked using proposed method (I did not released tensioner) - practically cannot lift it or just very little, but can move left/right easily (holding it at the highest point).
So, I would say chain is OK?
K2-K6:
That sounds fine with no real wear at all.
It doesn't matter if it's tensioned or not as you are effectively comparing the chain pitch with the sprocket pitch, with no realistic slack it shows it's virtually as new.
A chain can be tensioned as much as possible, but if worn you'll still be able to pull the links away from the sprocket at the centre of it's engagement. If you can't it's definitely good.
They move/slide slightly side to side, all seems fine.
deltarider:
Erny, your finding doesn't surprise me. On the German site camchains are often found not worn.
McCabe-Thiele (Ted):
I found this section on chains very interesting.
Trigger:
--- 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.
Out of the hundreds of SOHC/4 engines i have fully rebuilt i have only found a couple of cam chains that had minimum ware. It is still a false economy in my book as, a STD DID cam chain is only about £20 and will last at least 30,000 miles. That is about 66p per thousand miles and when most owners of classic bikes only do about a thousand miles a year, that is a lot of years from a chain ;)
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