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CB750/500 petrol tap renovation

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Laverdaroo:
Surely if and when the nitrile rubber starts to swell, disintegrate the surface area will increase slightly due to pits and holes and larger overall size?
This would suggest that when they start to go the process would only accelerate as more of it would be exposed ?

RE. If a ring has gone somewhere in /on the bike and it’s an OE piece, it could be assumed that the majority of the other seals in the machine that are subjected to similar conditions will be going or gone also meaning that as soon as you see one, it’s time to get all the others changed also?


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Oddjob:
As it's been said Roo, it's really only O-Rings and possibly seals (unsure what they are made of TBH and may already be immune) that are essentially submerged in the Ethanol inside modern fuels, carbs and taps for instance. I'd advise doing the internal engine O-Rings as well if possible to eliminate the potential of a failure in the future. That is of course if Viton rings are available in the sizes required. TBH I wouldn't advise pulling an engine apart to replace the O-Rings as the amount of Ethanol they could be exposed to doesn't make it worthwhile and the amount of time it would take for them to become a problem means it's just not worth it. However if you are already replacing O-Rings in the engine then I'd say might as well fit Viton ones instead, if possible of course.

taysidedragon:

--- Quote from: Oddjob on January 25, 2023, 05:16:40 AM ---Got to say that nowhere to my knowledge has anyone said anything about replacing any orings except for this forum. When I mention it to other bikers for instance they are totally unaware of it, as I’m sure are 99% of car drivers.

--- End quote ---

First post in this topic.
http://www.sohc.co.uk/index.php/topic,26449.0.html

Oddjob:
That post was a comment and post from a friend of mine after I’d brought the subject up on another forum,  he was trying to clarify all the mistakes and myths regarding Ethanol. The only reason he did that post was in answer to my comments in relation to the problems ethanol could cause, not in our bikes though as they are all post 2000 models but in any other bikes the members may also own. Members were surprised that the government hadn’t bothered to warn anyone about what introducing this into our petrol could cause.
 

Bryanj:
To do that would mean they were not all lying

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