Is that the "standard" motor(that is the name of it ) with overhead valves? After checking all of the advice here you will probably find that it is problems with the valves . I have two of these tractors and apparently they have very weak valve springs . If the clearances are good and you still have a miss then it is that the exost valve is getting sucked open on the intake stroke . What I did on mine just to get it running was I shimmed the valve with bushings/washers that fit between the head and the valve spring . There is a procedure for doing this -- please ask before attempting to do this . I am not sure why they have such weak springs --- like did they loose ther tension over the years or have the valves worn into the head so far that they lost there tension . The real proper fix here though would be to remove the head and have the valves + seats re done and the springs either replaced or have them shimmed to speck . Another symptom of weak valve springs is that when it is idling it is very irregular beat to it . Once the throttle opens up and it starts to work it will smooth out.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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