Your statement--- "I can screw the high jet in completely and it still runs fine except the revving." suggest you have a carb problem. In most cases, an air intake leak, will cause the saw to rev or go dead when idling.
Usually, backing the adjustment screws out, will mask the problem somewhat. Screwing the "H" screw in, cuts off gas supply. (leaner)
Your statement indicates that the carb gaskets may have been installed incorrectly, or the adjustment screws may have been switched?
On most Zama carbs, the sharp ended screw goes to the "L" position in the carb (closest to intake manifold.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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