Ok, not sure if your 1650's carb is set up the same way, but on my k301's the fuel going into the carb has to pass through a 90-degree bend. This spot likes to catch pieces of gunk and allow the engine to run, but just barely. It throws you off track, because the carb can look spotless when opened up. If your carb has that 90-degree inlet, check there. Who knows what you'll find! I found pieces of a fuel bowl gasket and a deteriorating gas cap (separate occasions.) good luck!
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Ian
Mine: 72 w/ k301, 3 125's, 1 w/ hydro lift, 38,42, & 2 48 decks, 2 42 front blades, QA-36a & QA-42a thrower, tiller, lo-boy 154. Also, LOTS of parts.
family's:2 105's, 2 106's, 149, 2 lo-boy 154s, Farmall Cub.
Non-IH: 1940 JD Model A, 1954 JD 40 U, 1955 JD 40 Crawler, 2 1956 JD 420 U's, both w/ Henry Loader and Backhoe. JD 110. Wheel Horse (model unknown.) Power King 1614. We love our tractors! 
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