Spark Plugs
Heat Range
When fuel is burnt imperfectly inside the combustion chamber, carbon is formed as a result. Spark plugs misfire and smouldering (burning without fire) result when this carbon sticks to the spark plug. These carbon deposits will burn off of the spark plug within a fixed temperature range, but if the spark plug’s temperature is too hot, pre-ignition, reduced engine output, and piston seizure can occur. Therefore, in
order to keep the engine running in top condition and prevent the above-mentioned troubles from occurring, each spark plug functions within a recommended operating temperature range. This temperature range is known as the heat range.
Spark Plug Lifespan
Even when properly used, spark plugs require periodic replacement. Spark plugs that have been used for a long time and that are degrading in quality will have difficulty in sparking, cause pre-ignition and cause engine trouble. This will in turn bring about reduced fuel economy. Keeping these effects on the engine and on fuel in mind, Yamaha selected the best possible spark plugs for your machine.
Fitment List PDF
Spark Plugs
