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engine rpm

Mark Glenn I have a Farmall M which I'm trying to set the correct low idle and high idle RPM of the motor. Can you tell me the easiest way to do this. Do I need a certain 4 cylinder tachometer, or what do you suggest. Thanks!
John M Im sure the correct way to do it is out there somewhere, Ive just never seen the procideure, but some places carry a tach that will attach to the distributor/ magneto to tell you the rpms. I use this thing my Dad had to check the rpms on the pto andadjust from that until I have between 550 - 570 rpms.

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