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While not admitting my age, when I started at an IH dealership "on the line" (which meant I was working on tractors) I got a work order to tune-up an M, which were pretty common then. The Service Manager (who I never saw smoke a cigar, but always had one to chew on in his mouth) let me tune the tractor up and put it on the dyno. When I was done, he walked over to me and said: "Do you know how to tell if you "got 'er set right"? Being the new guy, I said: "Well I set the carb and the tractor on the dyno for the best power." He just laughed, chewed on his cigar for a second and said: When you get 'er done, just pin her ears back (meaning go to wide open throttle) and slap the throttle back to idle. If she doesn't backfire twice, you ain't got 'er set right!
I always used that test after that and it has never failed me to this day.
I always used that test after that and it has never failed me to this day.