Jon Hagen: What kind of total horse power do you now have??? I can't see getting anywhere near the rated horse power with a much smaller carburetor. I think your on to part of the reason the JD new generation gas tractors do not run right. I think the air/fuel mixtures is wrong for any speed but wide open pulling full horse power. So your smaller carburetor is right for general utility type of jobs. I also would think your way short on total horse power. The MM "U" tractor was 40 horse power. The JD 4020 should be 90 Horsepower. So even with drill out the jets you air flow would be too restricted for maximum horsepower. I do think it maybe great for light HP uses.
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