Cylinder Head O-Ring 54x2 Viton for KTM/Husqvarna/GasGas 85 2003-2026 - 0770540020

This genuine OEM Viton O-ring (54x2 mm) is a critical sealing component for the cylinder head assembly. It is designed to provide a high-temperature, leak-proof seal between the cylinder and the cylinder head, ensuring optimal engine compression and cooling performance.

This part fits an extensive range of 85cc motocross bikes. It is compatible with KTM 85 SX (2003-2026), Husqvarna TC 85 (2014-2026), and GasGas MC 85 (2021-2026) models in both 17/14 and 19/16 wheel configurations. Additionally, it fits the KTM 50 SX Factory Edition for 2024-2025.

Constructed from premium Viton material, this O-ring offers superior resistance to heat, chemicals, and compression set compared to standard rubber. Using an original equipment manufacturer part ensures precise fitment and long-lasting reliability for high-performance two-stroke engines.

When rebuilding your top end, it is highly recommended to replace all cylinder head seals to prevent coolant leaks or loss of compression. Always ensure the mating surfaces are clean and apply a light coat of grease or assembly lube to the O-ring before installation to prevent pinching.

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