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Exp. Chamber O-rings - What Size?

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Does anybody know what size the expansion chamber O-rings are? (07 YZ250)

I gather they're made of Viton?

If I could find the size, I wouldn't mind buying a handfull of them from an o-ring / bearing store.

At least that's what I've always done with the KTM.

Cheers,

Bergermeister

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They are not really o rings. The gasket looks like an o ring from a distance, but even brand new the edges are flat..not round.

I have a local o ring shop, owned by the polygamists, who picked me out some worthy substitutes for 50 cents each.

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