Spark plug - NGK MR8K-9
Honda ordered NGK to make a special plug for Honda PCX, and NGK made a model number called MR8K-9. The same plug is also used by Honda ADV-150. Not many shop have this plug in stock, and many would just recommend using Honda RS150's specced plug. A quick call to Boon Siew Honda Malaysia's hotline revealed that other plugs are not recommended for Honda PCX 2018. This replacement is due every 12,000 km. It costed me RM25 including installation.