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YBR 125 (2010) Exhaust Gasket

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Hey folks, bit of an odd one ...

In the continuing job of bringing sons 125 back from storage I took the exhaust off (to de-rust and paint plus get access for other stuff) I noticed that there was no exhaust gasket.  Looking at the service manual; parts exploded diagrams and the (infallible) Haynes manual it appears that there should be a copper 'o' ring.  I did buy one from Wemoto in preparation for refitting the exhaust but the one supplied is a bit big to fit in the hole.

 

1.  I am right that  there is supposed to be a gasket?  Never noticed an issue with it missing before and there is no evidence of gas blowing from the recessed socket.

2. I haven't checked the amount it is over by but would it be ok to sand down the copper gasket?  Its a pretty chunky 'o'?

 

 

Any help appreciated

 

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How do you mean too big.

Too round or too thick. It is supposed to crush to a degree to form the seal.

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Hi Cynic, thanks for the response.

It's the diameter that's the issue - the one I have is 40mm which appears to be 2mm too large for the exhaust socket. I did order the one for a 2010 (actually cant find where I got it from - apparently wasn't on the wemoto order I did) but its looking like it might be for a different year (assuming there is a year variation).

I guess I could take the Dremmel to it and shave a mm off around it

 

 

 

 

 

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Double check there is no cack or old gasket left in there, some are 2 rings with a material centre, the outer may still be in place.

Got a part number, we can double check for you.

 

 

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Hi,

Ordered another gasket (from Womoto) and this one fitted (slightly smaller diameter, one surface flatter) ... think the first one was an eBay purchase so probably some sort of a knock off.  Still no idea why there wasn't a gasket there in the first place but will be when I'm done :-)

 

Thanks for the response

 

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