Countershaft O-Ring for KTM 85 SX, Husqvarna TC 85, GasGas MC 85 - 0770020180
Shipping and Availability
Shipping and Availability
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Description
Description
This genuine OEM transmission countershaft O-ring is a critical sealing component for your motorcycle's gearbox. Measuring 18.77x1.78 mm and manufactured from high-quality NBR 70 nitrile rubber, it ensures a tight seal on the countershaft to prevent transmission oil leaks. Maintaining a proper seal is essential for protecting your engine and ensuring consistent performance on the track.
This part fits an extensive range of youth motocross models across several decades. It is compatible with KTM 60 SX (1998-2000), KTM 65 SX/XC (1998-2008), KTM 85 SX (2003-2026), and KTM 105 SX/XC (2004-2011). Additionally, it fits Husqvarna TC 85 models from 2014-2026 and GasGas MC 85 models from 2021-2026, covering both small and big wheel configurations.
Manufactured to exact factory specifications, this O-ring offers excellent resistance to heat and chemical degradation from engine oil. Replacing this seal during routine maintenance or when servicing the drive sprocket helps maintain the integrity of your transmission's lubrication system. It is a direct replacement for the original factory part, ensuring a perfect fit every time.
For a successful installation, ensure the countershaft and surrounding surfaces are completely clean and free of debris. Applying a light coating of clean transmission oil to the O-ring before assembly can help it seat properly and prevent pinching or tearing. Regular inspection of the countershaft area for oil residue can help you identify when it is time for a replacement.
Check compatibility list below to see if this part fits your motorcycle model.