I"ll add a few more things. Spark plugs should be a non resistor plug. If you are not working the tractor continuously or putting it under hard loads then you may want to move up to a hotter spark plug but stay with non resistor plugs.
Champion recommended originally from what I have looked up a D16 spark plug. Most of their catalogs now recommend a D18 as the standard spark plug. If you run it with light loads or if you have an oil burner you may want to go a D21 Champion which is hotter than the D18.
Autolite plug is a 3116. Some will say a 386 is recommended but it is a resistor plug. Autolite doesn"t have many choices for a non resistor plug. At one time they made a 3118 which is hotter than the 3116 but in my latest search I did not find those anymore.
AC Delco offers a C85S which is non resistor but the C88L is resistor.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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