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CB550K - engine rebuild (partial or full)

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Charlie J:
Just to confirm what Oddjob has said, here’s a photo showing where the primary chain had chewed into the crankcase of my CB500 K1

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deltarider:
This is what a German engineer 'Maschinenbau' explained me. Chaindrive always implies play at the loadless part. Just watch the secundary drive chain. A tensioner is only needed when a chain travels over 60o to the horizontal. On our bikes the crank turns CCW seen from the LH side, so the lower part of the chain is loadless and will show play. That play there doesn't worry me.
Here is how I see it. Before I entered the internet, I had never heard of the primary chain causing problems, not from Honda mecs nor was it described in Dutch and German magazines.
Don't get me wrong. I am not denying the chain can eat in the crankcase. After all I myself once discovered an aluminium chip in the oil. When? Some 70.000 kms back... And there are also lots of photo's to prove it. You can make life easier for that chain by having the ignition timing even for 1+4 and 2+3 and the carbs balanced so that all 4 cylinders work as equal as possible.
So, would I replace that chain when the engine is opened? Definitely!
Would I open the engine just for that? No.
 

Bryanj:
Yes you only get play in the unloaded side of the chain but when that gets excessive, which is a shorter time when an idiot owns the bike(harsh use and little service) the movement allows the chain to act like a milling tool on the alloy and yes i have seen one eat all the way through into the oilway, i have also seen one, and only one, worn out crankshaft but personaly have never actualy seen the worn out cam covers the yanks go on about.
Different countries have riders with different riding styles as Yamaha found out with the RD350LC when after extensive testing they sold it to UK riders who promptly kept blowing exhaust gasket causing, i think, 4 different modification "kits"

Charlie J:
  :) :) That made me smile Bryan “when an idiot owns the bike” Just wanted to point out that although I own the bike in the photo I posted, the damage was caused some 30 years or so before I rescued it from where it had been abandoned in a shed. Although, that doesn’t necessarily mean that I am not an idiot :-\

Bryanj:
 : :D Perhaps i should have used the word initialy berween idiot and owns!!!!

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