SOHC.co.uk Forums > CB500/550
Head is leaking oil again. Again.
Brian.:
No, as per advice from here it was definitely thicker than the 2.4 in the parts book. After I bought my O-rings from Seal Supplies of Loughborough via Ebay (I bought various ones, not just those) I saw that Nurse Julie on here stocks and supplies O-rings, it's probably a good idea to see what she has to say on the subject.
I don't have the receipt for the O-rings I bought, but it would have been one size up I'd say. And I bought some in Nitrile and some in Viton.
I hope this helps!
Brian.
Brian.:
Further to the above, I've been through my Ebay purchase history at my O-ring purchases. Based on the Honda standard thickness of 2.4 and what I bought around that time, they would either have been 2.5mm Viton (which I doubt because it's hardly any thicker at all) or 3.0mm Viton. I'd say it's 99% definite that I used 3.0mm, which makes sense to me today as a proper thickness upgrade. And mine definitely didn't leak again up to when I sold it.
But, you would be far better advised by Nurse Julie's experience than my recollections!
I hope this helps.
Brian.
alexdecker:
--- Quote from: Brian. on September 02, 2021, 07:46:39 AM ---Further to the above, I've been through my Ebay purchase history at my O-ring purchases. Based on the Honda standard thickness of 2.4 and what I bought around that time, they would either have been 2.5mm Viton (which I doubt because it's hardly any thicker at all) or 3.0mm Viton. I'd say it's 99% definite that I used 3.0mm, which makes sense to me today as a proper thickness upgrade. And mine definitely didn't leak again up to when I sold it.
But, you would be far better advised by Nurse Julie's experience than my recollections!
I hope this helps.
Brian.
--- End quote ---
Thank you Brian! I've written Julie on here in a PM, so hopefully I will hear from her soon :)
alexdecker:
Just a quick update question: Since I've just changed the entire gasket set for the top engine, can I take it apart and only substitute the O-rings, or do I have to substitute the whole thing when I take it apart??
Bryanj:
Depends on if it was an originaly sticky gasket and does not rip when you take the head off also only if it hasnt been run
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