Thank you for your help Jaka54. My 61 SF is now reassembled, accept for cleaning out the inside of the carburetor. Am I corect that I need to break in the new ring as if it were a new engine? BTW, I removed the needle valve and saw some specs of dirt in the cavity, so I'm going to remove the needle valve treaded portion and clean the inside of the aluminum cavity of the carburetor

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