Is there a big difference between spark plug heat range 6 and 7?

[Ramos]

There is a significant difference between spark plug heat range 6 and 7. Spark plug heat ranges are divided into nine levels, with 1~3 being low heat range, 4~6 being medium heat range, and 7~9 being high heat range. Therefore, spark plug heat range 6 belongs to the medium heat type, while heat range 7 belongs to the high heat type. Effects of changing spark plugs: 1. Decreasing the spark plug heat range: When decreasing the spark plug heat range, incomplete combustion of the air-fuel mixture may occur, leading to symptoms such as insufficient power. Additionally, inadequate heat dissipation may cause the spark plug to overheat, potentially resulting in phenomena like detonation. 2. Increasing the spark plug heat range: When increasing the spark plug heat range, the heat dissipation capability improves, causing the spark plug temperature to drop faster. However, this may lead to carbon buildup on the ignition tip, which can cause electrical leakage and prevent the spark plug from firing properly.