If you have been told that ngk br9 eix spark are the same for my ktm 85 sx and myktm 125 sx?

While the NGK BR9EIX spark plug may fit both the KTM 85 SX and KTM 125 SX, it's essential to check the specific requirements for each model. The 85 SX typically uses a different heat range and plug type than the 125 SX, which could affect performance and engine efficiency. Always refer to your owner's manual or consult with a professional to ensure you're using the correct spark plug for each motorcycle.