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Ed, I guess I cheated a little to be able to get the right RPMs. The PTO rpm is a function of the engine rpm, from the manual an engine rpm of 1500 will give a PTO rpm of 536. So if your interested in exactly 545 (or max of 545!), then the engine rpm should be 1525. That was easy, now the hard part. Your '46 2N motor (and front mount dist) is just like my '47 motor (just happens to be mounted on a '50 chassis, hybrid tractor). In order to use an external tach/dwell meter, like those you can purchase at most any car parts store ($25 to $50), you need to to be able to tap into the dist at the screw terminal where the condenser wire, points wire and coil "pigtail" connect. I added an additional wire to this terminal and ran it out of the side of the dist up to just behind the water pump (for easily access when I connect up to it) (It is taped up and protected from the weather or shorting out against something when not in use). I connect my meter leads to this wire and a good ground. Then using this meter, run the engine up to the desired rpm (in this case 1525) and mark this location on the throttle quad. Because the throttle quad really controls the governor, the position marked will always be 1525 rpm no matter what the load (if the governor is functioning correctly). One added benifit is with this meter you can now also check the dwell at the same time! When installing a new set of points, I set to the proper .015 gap, and then once the dist is reinstalled, use the meter to check (it should be 60 degrees of dwell) and note it in my records. Then as time goes by and I want to know the condition of my points, I just hook up my dwell meter again check the dwell. This will tell me if the points have worn, burned, etc. (Also saves a lot of time, don't have to remove dist to check the points) You can also adjust your idle rpm (400), max rpm on the governor (2200), and throttle linkages. Good Luck, Jim
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