After searching the internet some more, it looks like all the tags identify is where it was made and for what industry. So, in your case tsx says it is an agricultural carb and the numbers 159 and 422 are code for the different locations where each were made at. If your concern is stepping down in cfm you are already doing that if you have a true original wd manifold from a 201 engine on a 226 wd45 engine. The wd manifold originally had smaller ports than the wd45 manifold. A new replacement today for a wd today is now the larger ported manifold used on wd45's.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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