Low cost compression testers are available in most auto parts stores or even cheaper on Amazon. It is a simple procedure to do. A dwell meter will tell you the condition of your points very easily and you will start to learn about your engine. Black sooty plugs can also be caused by a dirty/clogged air filter/spark arrestor. All of the other suggestions are possible also. It takes a bit of reading and a little dirt under the fingernails and you become more independent. Give it a try. ____Grant.
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