First of all the needles you refer to are IDLE adjustment ., not load. The load is adjusted by the large slotted screw that is in the center of the BOWL retaing nut. Best way to set that , is engine totally up to temp, at least 170. The idle needles are set one cyl at a time, also at operating temp, one plug wire, then the other removed and takes a little getting used to with a tack being used also.The RPMS you asked for are 975 loaded same as a (A), and 1115 high idle , give or take a couple at high idle. Some tractors on the load screw, need varying adjustment, any wear from closed to a turn or 2 depending on cond of tractor ,carb and area conds.
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