All of the aftermarket carburetors on Amazon that claim to fit the Echo RY25AXB, don't To be more specific, the carburetor itself fits and works great. The throttle cable won't attach to it, though. The cable on the blower has a z-bend where the butterfly lever on the carburetor is designed for barrel connector. Usually you can just unclip the connector, pull it out and stick the z-bend in the hole. That doesn't work in this case, though, because the hole it too big and the z-bend just pops right out. This is a super simple adapter that sits in the hole on the lever that you can attach the z-bend to. It works great and is probably best printed on a resin printer. Even better is a resin printer with a magnetic flex plate, so you can print the adapter flat on the plate, as I did here.