**Step 1: Preparation**.
- Ensure that the multimeter is set to the appropriate setting for measuring RPM.
- Locate the spark plug wires of the engine that you want to measure the RPM of.
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**Step 2: Connect Multimeter**.
- Connect the black probe of the multimeter to the ground of the engine.
- Connect the red probe of the multimeter to the first spark plug wire.
**Step 3: Start the Engine**.
- Start the engine and let it idle.
**Step 4: Reading the RPM**.
- Look at the reading on the multimeter. This number is the RPM of the engine at idle.
**Step 5: Increasing the RPM**.
- To increase the RPM, have an assistant slowly increase the throttle while you monitor the multimeter reading.
**Step 6: Recording the Results**.
- Record the RPM at different throttle levels to get a thorough understanding of the engine's performance.
**Step 7: Shutting Down the Engine**.
- Once you have finished measuring the RPM, shut down the engine and disconnect the multimeter.
**Step 8: Safety Precautions**.
- Remember to always wear safety gear such as gloves and goggles when working on engines.
- Make sure the engine is cool before attempting to measure the RPM.
**Conclusion**.
Measuring engine RPM with a multimeter is a simple yet effective way to gauge the performance of your engine. By following these steps carefully, you can ensure accurate readings and keep your engine running smoothly.
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