Rotax NGK GR9DI-8 Spark Plug

The NGK GR9DI-8 spark plug is the official, homologated spark plug for Rotax Max karting engines, including the Rotax Max Evo, Senior Max, Junior Max, and DD2. Engineered to Rotax's precise specification, this iridium-tipped plug delivers consistent ignition performance, reliable combustion, and the durability demanded by competitive karting at every level.

Whether you're racing at club level or competing on the international stage, the GR9DI-8 is the plug your Rotax engine was built around. Its fine iridium centre electrode ensures a precise, repeatable spark cycle after cycle—helping you extract maximum power while maintaining engine reliability throughout a full race weekend.

Key Features

• Official Rotax Max homologated spark plug — competition legal
• Fine iridium centre electrode for precise, consistent ignition
• Optimised heat range for Rotax Max engine operating temperatures
• Superior anti-fouling properties for clean running in all conditions
• Excellent durability and wear resistance at high RPM
• Direct OEM replacement — no modification required

Compatibility

• Rotax Max Evo (Senior & Junior)
• Rotax DD2
• Rotax Micro & Mini Max (confirm with your engine spec sheet)

✔ Genuine NGK part  |  ✔ Official Rotax specification component