Let us get back to basics. An engine needs THREE things to run. 1) Compression
2( A proper fuel and air mixture.
3) A properly timed spark.
Since you already have noted a problem with the spark, that would be the place to begin troubleshooting. You need a good strong spark in order for the engine to run right. A weak yellow spark simply will not do. You need a decent blue spark to run properly. Check for the correct ignition coil. Check the points for proper alignment, clean contacts, and resistance. Check the condenser. Any of these items can cause weak spark. Until you get a good spark, you are wasting your time to try to find the problem elsewhere. A general rule of thumb in fixing any problem is to repair the KNOWN problems FIRST. Changing plugs or checking distributor advance is pointless without a good spark.
Also, it is not normal to idle the engine down to 300 RPM. Stick with the manufacturer's recommended idle speed.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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