I bought a Saito 62 from a guy on here that he sold because it was breaking muffler manifolds

It came with a new manifold. I'm using it for the second year and have never even adjusted the needle valve let alone have muffler trouble.

He sent an aluminum spinner and adapter nut along with it, The 2 1/4" spinner had been forced over a prop without being cut out. I don't know if that was the problem or not?