SOHC.co.uk Forums > CB350/400
Smokey rebuilt 350
AshimotoK0:
IMD don't list them . I think C90 is 47mm bore size though or possibly C70 or both. Hairygit will know. I may have some sort of Honda 90 rings at home ..will check tonight.
Hmm think C90 may be 50mm bore ...ST70 is 47mm though.....Hairy ?????
paul G:
--- Quote from: AshimotoK0 on April 13, 2018, 01:01:39 PM ---IMD don't list them . I think C90 is 47mm bore size though or possibly C70 or both. Hairygit will know. I may have some sort of Honda 90 rings at home ..will check tonight.
Hmm think C90 may be 50mm bore ...ST70 is 47mm though.....Hairy ?????
--- End quote ---
They do carry a lot more stock than just what is on the web site give him a ring.
royhall:
Just dug out of the pile a new set of Genuine Honda 350F rings, and they have a "T" and the oversize stamped on exactly the same as Cruzin. I guess the Genuine's I have are fake..... They mike up exactly the same size as well, and they look the same...... I guess I need 4 sets of Riken rings in 47.5mm for the oversize...... Alternatively, I do have a set of Cruzin +1mm pistons that I got for free, I may ask Trigger to do a rebore and check the rings at the same time. If he doesn't like the look of the rings I can source some 48mm Riken items....... Am a bit concerned about putting this back together with anything non Honda, but the price for NOS Honda pistons/rings/pins is just too high for what the bike is worth. Also, I will go to the lockup next week and see if I can find the original STD pistons and see what condition they are in. Maybe I could source a set of good nick standard barrels and use those with new rings...... I am well confused with this, not sure which way to go for the best. But I do know that I dont want to be doing this again in a few months so it needs to be right this time.
hairygit:
Okay, C90 all models from 1977 onwards are 47mm bore and 49.5mm stroke, with a compression ratio 8.8 :1 giving 85.8cc
K2-K6:
Those rings on the USA bike are more like horseshoes! I'd be worried if I had those.
Like anything manufactured, you can get a problem occur which is why you'd try to have batch identifications to help pull the affected parts from giving the supplier a poor reputation. If the company policy effectively locks that route off its a catch 22 for the client and you're left to express your findings freely to others.
It shouldn't be like that as other stuff appears to have reasonable views for similar items. They'll shoot themselves in the foot by sticking to that method of selling.
Obsolete pistons and rings are often made in batches to best support slow sales, it's possible that it could be a substandard batch of rings in supply chain, but if they won't look at it then not much you can do.
As you say Roy, to go toward a rebuild with the effort, cost and anticipation that entails, then it's a real pain with a poor outcome.
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