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1976 CB550F1 (what have I let myself in for) Project
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.
Laverda Dave:
Have you tried swapping the oil rings around between the pistons? This will tell you if it's the piston ring gap not having enough depth or if it's the actual rings at fault. The 250RS piston I had a similar issue with was a pattern part from DSS. I can't remember the actual make but it was pattern but not IMD or Cruzinimage. I remember it was in a blue and white box though.
Laverda Dave:
I would also try swapping the outside pistons with the inside pistons for a comparison and to confirm if it's the bore or the piston at fault. I'd also swap the con rods over for the same reason. Obviously don't run it like that it's just for comparison purposes at this stage.
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