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In the process of commenting on another posting, I took a close look at the linkage on my 9N. The rod ends on the links make it easy to remove the links without tools, but the spring retention also creates exactly this problem since there is not a positive connection from the hand throttle all the way back to the governor arm. Too many springs. With the tractor shut off, move the linkage from full throttle to idle, both quickly and slowly. Observe the final position of both the carburetor throttle and the governor arm. I'll bet you'll find that the arm doesn't go all the way forward (nor does the throttle get to the idle stop) when you move the throttle slowly, but will get there if you bang it shut quickly. The spring atop the front end of the rocker shaft helps correct this a little. I have some problems with mine because it is a 9n/8n hybrid with a side mount distributor and 9N style linkage -- the linkage hits the ignition wires which worsens the problem. The problem in my case is fairly subtle -- the difference between 700 RPM and 400 RPM. I can easily see it being worse on linkages with more wear/slop. If this is the root of your problem, the good news is that the cause is readily visible and you don't have to remove and tear down the governor. Try bending the governor link rod per the directions in the FO-4 manual to put a little more bias towards closing rather than opening the throttle. If you have an 8N, the linkage is different and I don't know how much this issue might (or might not) aflict it.
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