O ring for filler cap

[Robfzs]

seem to have lost mine when i changed the oil last

anyone know the size/where to get one ? thanks

[Motorbreath]

I bought my bike without it. Years later I discovered it exists, so I went for the stupid ring to a Yamaha dealer. They gave my a too large one, for 5€  :eek . It didn't fit well so my bike is working without it again.

[limax2]

The O ring is 2.5mm dia section and 27mm inside dia. You might get one from a car accessory shop. They usually have a box with a large selection of sizes in it and will probably charge from 10 pence to 50 pence. If they don't have the exact size but have a larger one with 2.5mm section, you can cut the appropriate length out (with a razor blade) and glue the ends together with super glue. I certainly wouldn't pay the Yamaha price  :eek  for a simple O ring.

[Motorbreath]

Thanks Limax. I have found the damn 5€ ring. It is the correct size, so it is my fault, I tightened the cap too hard! I thought it could be lost otherwise. I am going to put the o-ring again...

Edit:
Yes, I am such a great mechanic! :wall The cap border is even a bit cracked, still useable, but wtf!

[Captain Haddock]

Back to the god old bearing supplier, agricultural engineers are good for stuff like that too, car shops and bike dealers are always the last stop for me.