Spark plug gap is typically set between 0.6 to 0.7 mm. If the gap is too wide or too narrow, the side electrode should be adjusted accordingly—either pressed down or lifted—to bring it within the recommended range. In practice, this adjustment is common. However, you might find that even when the gap is within the correct range, the engine may still fail to start. On the other hand, sometimes the gap is outside the standard range, yet the engine starts and runs fine. Why does this happen?
First, the spark's ability to jump the gap depends on the surrounding gas. During cold starts in winter, gas molecules are harder to ionize, requiring a higher voltage to create a spark. If the gap is properly set, it might actually cause misfiring due to the high voltage needed.
Second, some engines experience demagnetization or reduced insulation in the coil, which lowers the voltage generated by the magneto. In such cases, reducing the spark plug gap helps the system produce a spark more easily.
Third, if components like the piston, piston rings, or cylinder sleeves are worn, the compression pressure inside the cylinder drops. This makes starting difficult, but the magneto might still perform well. In this situation, increasing the spark plug gap can result in a stronger spark. A larger gap creates a longer arc, making it easier to ignite the air-fuel mixture, thus improving both starting performance and overall engine efficiency.
Understanding these factors helps in making better adjustments based on real-world conditions rather than just following standard specifications. It’s all about balancing the electrical requirements with mechanical wear and environmental factors.
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