You say the load screw does absolutely nothing. Do you mean you can screw it all the way in and it will not kill engine or keep screwing it out and notice no change. A lot of the packings behind nut are too long and needle will bottom in nut before end of needle gets to the main jet inside carb. Another thing, there are different lengths needles used with a different taper on needle and jet also for power improvement packages like fire craters. Then the main jet is calibrated for full load so screwing it out ten turns will not give more fuel than the size of jet, only limit amount delivered for light loads. On a side note, first 450 gas I did a valve job on had a burned intake valve with low hours from needle screwed in to save that extra fuel but he used it that way on all loads. IH did give him a free valve job though.
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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