Ultrasonically cleaned and non-professionally rebuilt this carburetor myself. There were no identifiable tag or part numbers on it, but several characteristics helped identify it: a) 7/8-inch fuel inlet - new brass fittings are included b) larger secondary bores - spread-bore pattern, NOT square-bore c) internal gasket patterns d) this post at another forum As mentioned, I'm no pro, but did a very thorough job cleaning and rebuilding this carb. The two idle air inlet screws were screwed fully in, then backed out exactly two full turns, as suggested by the carburetor setup manual. The thermal choke was given especially good cleaning, in order to insure proper operation. Several pictures are attached for your review.