NGK B6HS spark plug for 2-stroke engines. The spark from the plug ignites the fuel mixture in the engine cylinder (2-stroke).
Replace it if starting is difficult, if there are misfires and carbon deposits on the electrodes. Choose by thread and heat range. Thread the spark plug in by hand until it stops, then tighten it with the wrench without excessive force so as not to strip the thread. The color of the deposits on the electrodes shows how the engine is running: light brown is normal, black and wet means a rich mixture.
