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I am starting to look deeper into the claim that later DCOE's Idle Enrichment Screws are typically turned-out further. The details in the screw interface to the carb body distill to: 1. For the same flow: A narrow tapered needle needs to be tuned out further than a wider tapered needle if the orifice size is the same. It is proportionate to 1/tan 2. For the same fuel flow, a needle with the same taper needs to be turned out more from a smaller orifice than for a larger orifice. So to compare an early carb's Idle Enrichment Screw turn-out to a later, one must know the taper of the needle and the orifice size. In another post I measured the threads on early and later DCOE Enrichment screws and it was 0.8 for both. The part number for 40DCOE151 Enrichment screws is 64750.003 The DCOE151's I am tuning have this needle: 64750.004 64750.001 is stated to be "38 degrees" and for "early DCOE carbs" 64750.002 is the air bypass screw From the above, the 003 and 004 do seem narrower than the early 001.
