What is the gap of the spark plug electrode on the P-6?

• A. 0.040"
• B. 0.025"
• C. 0.030"
• D. 0.035"

Answer: (C)

Spark plug gap is the distance the spark must jump between the center and ground electrodes. For the P-6, the manufacturer specifies a 0.030 inch gap, which is chosen to match the ignition system’s voltage and the engine’s compression so a reliable spark forms across the range of operating conditions. If the gap is larger than this, the ignition coil may struggle to jump the gap, causing misfires or rough running, especially at higher RPM or under load. If the gap is smaller, the spark is easier to form, but may not provide a robust ignition under tougher conditions, potentially reducing reliability. Use a feeler gauge to set the gap to 0.030 inches by carefully adjusting the ground electrode as needed.