78-014814 or similar
![FMF Beta 2-stroke Pipe O-Ring and Spring Kit](http://shopbetamotorcycle.com/cdn/shop/products/18600700_{width}x.jpg?v=1549760966)
Replacement o-rings and springs for the expansion chamber of 2013-on 300RR, 250RR, 200RR, 125RR Race Edition, 2020-on 125RR, as well as the XTrainer.
FMF Beta 2-stroke Pipe O-Ring and Spring Kit
Produced by FMF of USA