Exhaust Valve O-Ring for KTM 85-300 EXC/SX fits 1998-2026 - 0770021120

This genuine OEM O-ring (12.37x2.62 NBR70) is a critical component for the exhaust control system. It ensures a proper seal within the power valve assembly, preventing leaks and maintaining optimal engine performance. As an original part, it guarantees a perfect fit and reliable sealing properties.

This part fits an extensive range of 2-stroke models across several decades. It is compatible with KTM 85 SX, 125 SX, 150 EXC/SX, 250 EXC/SX/XC, 300 EXC/SX/XC, and 380 SX/MXC from 1998 to 2026. It also fits Husqvarna TC 85, TC 125/250, TE 150/250/300, and TX 125/300 models, as well as GasGas EC, EX, and MC 85/125/250/300 models.

Made from high-quality NBR70 nitrile rubber, this O-ring is designed to withstand the high temperatures and chemical exposure typical of exhaust systems. Replacing worn seals helps restore consistent power delivery and prevents oil or exhaust gas seepage from the control mechanism.

During installation, it is recommended to lightly lubricate the O-ring with a compatible grease to prevent tearing or binding. Regular inspection of the exhaust control assembly is vital for maintaining the responsiveness and smooth operation of your motorcycle's powerband.

Check compatibility list below to see if this part fits your motorcycle model.