A spark plug is a device that delivers electric current from the ignition to the combustion chamber of an engine to ignite the compressed mixture of air and fuel.. All motorcycles, including those ...

Spark plugs, as the name suggests, generate a spark that ignites the air-fuel mixture in the engine to generate power to the rest of the motorcycle. They're an important component to all ICE vehicles.

What exactly gives Harley-Davidson motorcycles their distinctive sound? Some engines hum. ... To make this arrangement work, the spark plugs had to be positioned in a 45-degree arc.

Harley-Davidson's factory warranty does not cover consumable parts and items like batteries, tires, drive belts or chains, filters, spark plugs, paint chips, and fluids.

Thunderous noise. The potato-potato-potato idle of the shuttering engine. Back-breaking bulk. The manoeuvrability of a tank. These are qualities that have made Harley-Davidson what it is today ...