Break fluid level sensor o ring

[Geobob]

Has anyone had to replace this o ring? I rebuilt my front master cylinder and in the process I pulled the sensor out and noticed the only reason fluid does not leak out the bottom of the reservoir is the o ring around the shaft on this sensor. The rebuild kit did not include this o ring. I have it back together and it feels like it works just fine but I have a leak. Not sure where it is but the bottom line is there is a leak. It would be easy enough to replace the o ring. I am wondering if it is a specific size that is easy enough to come by. I checked and it does not appear to be available from Yamaha. Considering it is 32 years old it seems like it would not hurt to replace it

[Marcarl]

It looks to me like the o-ring should come in the kit. Did you get all the parts listed on the parts phish?

[Condor]

A few years ago I picked up an 'O' Ring kit from Harbor Freight. Cheap, and seems to have just about every size O ring up to about 25mm in it. I've used it to find several needed rings. Worth the money and a time saver...

https://www.harborfreight.com/397-piece-metric-o-ring-assortment-67580.html?_br_psugg_q=o+ring