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NE gasket set, do I need thicker o-rings?

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Oddjob:
I have a brand new unused head gasket, genuine Honda, for the Cb500K, I could measure that if it helps.

Bryanj:
Depends how oldit is Ken, supposedly thickness changed when asbestos was removed and that was some time ago

Oddjob:
It's an original Honda one Bryan, full top end kit, in that green flat packaging they used to do back in the 70s. I have 2 of them IIRC plus a couple of the bottom end kits as well. I also have a couple of aftermarket kits lying around, must see if there is a difference in between the 2 head gaskets whilst I'm up in the loft, can't recall whose makes the other kits are but Noburo or something sounds familiar. Kits are 40 years old now.

SteveW:

--- Quote from: Oddjob on October 24, 2022, 12:39:07 AM ---I have a brand new unused head gasket, genuine Honda, for the Cb500K, I could measure that if it helps.

--- End quote ---
If you don’t mind that would be great. Thanks

SteveW:
I've just measured the new o-rings in the new gasket set.

The originals are 5 x 2.4 mm, these are 5 x 2.0 mm. So with the gasket being 0.1 mm thicker and the o-rings 0.4mm thinner that's 0.5 mm under size.

I'm not risking fitting these 0-rings, I'm ordering some 5 x 2.5

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