SOHC.co.uk Forums > Project Board
1976 CB550F1 (what have I let myself in for) Project
Nurse Julie:
There is a Forum member called Ashdowner, Andy, who had exactly the same problem with a set of 550/4 K3 pistons / rings (or maybe just rings, I can't quite remember now) that he bought from Silver. It almost drove him mad as he couldn't get the 'sandwich' together on the oil rings at all. He even sent them back to Silvers and they said they were fine. In the end, he fitted a set from another supplier or fitted the old ones and they fitted just fine.
eight0:
Ok breakthrough moment.
I tested each ring individually. Top two are fine but the oil rings are the issue. I tried with just one of the thin rings either side of the oil scraper and no difference.
I tried the two old pistons thin oil scraper rings and.. no binding.
Now I guess I could carefully file down the new rings, but can I or should I use the old thin rings, bearing in mind they are not oversized.
Bryanj:
No complain to supplier that either the rings are wrong or the piston incorrectly machined, if you have bored the block you cant use standard rings without oil burning and mucho smoko
eight0:
Didn't think so. Just to clarify, I only meant using the old thin bottom two rings not the top thick ones.
What are they going to offer though? All the rings can't have the same issue surely. If they give me a complete new set I'd have to get a rebore done again and probably at .50.
eight0:
There's still another problem besides this. I test fitted the pistons and barrels to see if, without them binding as much it would turn over ok.
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Both outer pistons are still not centered. On piston 1 The inner side has +.60 clearance and on the other side I can't get a .05 feeler in the gap. It's the opposite with number 4. Gap is on the outside.
Sorry for the flurry of messages over the last couple of days. I took Friday and Monday off work to make some progress and this has stopped me in my tracks. I appreciate all the help.
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