You should have a HOT, BLUE spark that will jump half an inch or more. If you do not, then your problem is in the ignition. I have seen failures in the coil and ignition pickup in the distributor.
Technically, the pickup in the distributor is called a PIP sensor. Early ones were housed in a black rubber compound that deteriorated over time. They were later replaced with a light tan colored one. Also, check the resistance of the coil primary. If it is out of range, it will cause a no-spark or weak spark condition.
While we are at it, don't forget that there are other things that will make an engine refuse to start besides spark. Compression and fuel are the big ones. Spark needs to be at the right time, compression will tell you if the timing chain or gears have failed.
The short answer is that there is no short answer. .
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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