RE: OLd OS 25 max
If you have an old O.S. Max .25 FSR, then parts for it are no longer available for it from O.S., in Japan, or from us. If it's a newer one, then parts may be available in a limited way. We'd need more information as to which O.S. .25 you have. Please let us know what is cast onto the crankcase, or post pictures of both sides of the engine that are clear enough for us to see the markings. Then we can see how we may be able to help you.