SOHC.co.uk Forums > CB350/400
Smokey rebuilt 350
Nurse Julie:
--- Quote from: royhall on April 13, 2018, 01:34:58 PM ---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.
--- End quote ---
The thing is Roy and it's well advertised all over internet, Riken make piston rings for Honda. I can't imagine Riken making 'to spec' piston rings for Honda and sub standard rings for every other supplier that sells them as Riken, including Cruzinimage. Now, I can understand a pattern part maker making parts that look identical and selling them as such and there is no way we will ever really know if what we are buying really is 'Genuine' or not. It also doesn't mean that the more we pay, the more chance of the product being truly 'Genuine'. Those days are long gone. Agree with Nigel though, could be a sub standard batch.
Edit...as an example we buy OEM indicator stems direct from the same supplier that Honda buy them from in Malaysia. Honda put them in Honda bags with a part number and then charge $$$$$$ more. They all come off the same production line.
royhall:
--- Quote from: Nurse Julie on April 13, 2018, 02:18:35 PM ---
--- Quote from: royhall on April 13, 2018, 01:34:58 PM ---Just dug out of the pile a new set of Genuine Honda 350F rings, and they have a "T" and the oversize stamped on exactly the same as Cruzin. I guess the Genuine's I have are fake..... They mike up exactly the same size as well, and they look the same.
--- End quote ---
The thing is Roy and it's well advertised all over internet, Riken make piston rings for Honda. I can't imagine Riken making 'to spec' piston rings for Honda and sub standard rings for every other supplier that sells them as Riken, including Cruzinimage. Now, I can understand a pattern part maker making parts that look identical and selling them as such and there is no way we will ever really know if what we are buying really is 'Genuine' or not. It also doesn't mean that the more we pay, the more chance of the product being truly 'Genuine'. Those days are long gone. Agree with Nigel though, could be a sub standard batch.
Edit...as an example we buy OEM indicator stems direct from the same supplier that Honda buy them from in Malaysia. Honda put them in Honda bags with a part number and then charge $$$$$$ more. They all come off the same production line.
--- End quote ---
Cheers Julie and all who contributed. Am going to PM Trig about some rebore and skim work. About time the experts had a look at this.
K2-K6:
https://www.ebay.co.uk/p/74-Honda-Cb350-CB-350-F-OEM-Cylinder-Crankshaft-Piston-47mm-Pins-Rings-B/1111807780?iid=391925978680
Any use?
royhall:
Thanks for that. Unfortunately I am now way over stock bores so cant use them.
Decided to go with the Cruzinimage piston kit I got for free and rebore the cylinders to the full +1mm.
Took it to the engineers yesterday and by chance he was just starting a rebore on a 400F so he said he would do them straight after whilst he was set up. Anyway 24 hours later I have picked them up, top service. He has matched the pistons to the bores individually as the Cruzin pistons have 0.0005" differences, good job he checked. He said the 400F before it had NOS Honda pistons and they were way worse. So heads up if you having a rebore, get them to bore each cylinder to a specific piston.
More learning curve, and possibly a contributor to the smoke who knows.
K2-K6:
It sounds like he's on the ball with measuring each one.
Years ago someone who just specialised in rebores said to me, the golden rule is to never machine until you have the piston in front of you, and to measure every piston as it's not often they're the same!
Unsure how familiar you are with this area of engineering. If you put the new piston and rings in the bore before assembly of the engine, it should sound and feel as if the rings are running over emery cloth. It's this action that "cuts" material off the rings to make them fit the bores during run in process.
Hopefully you'll have covered off all your issues leading to the rebuild.
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