Running too close of a plug gap on a motorcycle engine can have several consequences, primarily related to the ignition system and combustion process. Here are some potential issues that may arise:
Difficulty in Ignition: A smaller plug gap means the spark has a shorter distance to jump between the electrodes. This can make it harder for the ignition system to generate a strong and consistent spark. As a result, the engine may experience misfires or have difficulty starting, especially under higher load or at higher RPMs.
Reduced Combustion Efficiency: The plug gap plays a role in determining the size and intensity of the spark. If the gap is too small, the spark may be insufficient to ignite the air-fuel mixture properly. This can lead to incomplete combustion, resulting in reduced power output, decreased fuel efficiency, and increased exhaust emissions. It can also cause engine hesitation, rough idle, or poor throttle response.
Increased Heat and Wear: A smaller plug gap can cause the spark to concentrate in a smaller area, leading to increased heat generation. This excessive heat can affect the spark plug, ignition coil, and other components of the ignition system, potentially causing premature wear, overheating, or even damage. It can also contribute to pre-ignition or detonation, which can lead to engine knocking and damage to internal engine parts.
Shortened Spark Plug Life: The smaller gap requires the spark to jump a shorter distance, which can increase the stress on the spark plug electrodes. This can lead to faster electrode erosion, fouling, or overheating of the plug. Consequently, the spark plug's lifespan may be reduced, requiring more frequent replacement.
It's important to note that the ideal spark plug gap size varies depending on the specific motorcycle engine, its ignition system, and the manufacturer's recommendations. To ensure optimal performance and reliability, it's advisable to follow the recommended spark plug gap specified in the motorcycle's owner's manual or consult with a qualified mechanic.