Let's say you've just removed an old spark plug. Does it have any life left in it? Can it be reused if it is cleaned properly? Let's take a closer look.

Heat Range: A spark plug's heat range classifies how insulated the center electrode is from the spark plug threads, and thus, the cylinder head. The heat of combustion warms the spark plug tip ...

A clogged silencer and fuel screw adjustments bring the engine to life. With a clean spark plug and proper idle speed regulation, the Honda Dio AF 27 is running smoothly again.