The frequency of spark plug replacement for motorcycles can vary depending on several factors, including the type of motorcycle, its specific engine, and the spark plug's design and material. As a general guideline, it is recommended to inspect and potentially replace the spark plugs in a motorcycle every 8,000 to 12,000 miles (12,875 to 19,312 kilometers) or approximately once a year, whichever comes first.
The manufacturer's guidelines often take into account the specific characteristics of the motorcycle's engine and the spark plug's design.
Regarding the typical lifespan of spark plugs, it can vary depending on factors such as the plug's construction, materials used, engine conditions, and the type of fuel and oil being used. Most modern spark plugs have a lifespan of around 20,000 to 30,000 miles (32,187 to 48,280 kilometers). However, some high-performance or specialized plugs may have shorter lifespans and require more frequent replacement, while others designed for longevity may last longer. Again, consulting the manufacturer's recommendations is the best way to determine the specific lifespan of spark plugs for your motorcycle.