Service Kit Fits Yamaha DT125R (1991 to 2003) Service kit comprises of 1 x Hiflofiltro Air Filter and 1 x NGK Spark Plug NGK are the world leaders in spark plug technology, it naturally follows that the world's motorcycle manufacturers make NGK products their No.1 choice for OE fitment. NGK spark plugs are designed using the latest technology to give optimum performance over the engine’s entire rev. range. NGK standard spark plugs with copper cored centre electrodes for wide heat range. Copper’s superior heat conductivity dissipates the heat of combustion away from the firing end, preventing hot spots that can lead to pre-ignition A wide heat range means the spark plug performs well with either a hot or cold engine. Performing well at high speeds as well as low speeds, and stop go riding i.