How-to: Step by Step. Before you can break in your generator, you need oil, gas, and a few other supplies. Start the lubrication process. Remove the spark plug. Add the oil. Add the fuel. The first hour. Change the oil. The second hour. Change the oil again.It does take a few hours of your time but the process for properly breaking in a generator is quite easy, even if you don’t know much about engines. Follow these steps and your generator should be working well for years to come. How to Break in a New Generator.

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