O-Ring for Countershaft Transmission - J780002124000

This is an OEM O-ring used in the transmission countershaft assembly. It provides a reliable seal to prevent leaks and ensure smooth operation of the gearbox components. Direct replacement for KTM and Husqvarna 390 series motorcycles.

Compatible with 2026 KTM 390 Adventure R/X (all variants EU/GB/RW/US), 390 Duke (black/blue EU/GB/RW/US), 390 Enduro R (EU/GB/RW/US), 390 SMC R (EU/GB/JP/RW/US/CKD/IKD), Husqvarna Svartpilen 401; 2025 KTM 390 Adventure R/X (all variants EU/GB/RW/TW/US/nHD), 390 Duke (blue/orange EU/GB/RW/US/ASIA/nHD), 390 Enduro R (orange EU/GB/RW/TW/US), 390 SMC R (EU/GB/RW/US/CKD/BR/CO/nHD), Husqvarna Svartpilen 401 and Vitpilen 401 (all variants EU/GB/RW/US/nHD); 2024 KTM 390 Duke (blue/orange EU/GB/US/IKD/nHD), Husqvarna Svartpilen 401 and Vitpilen 401 (all variants EU/GB/US/TW/IKD/nHD/ASEAN).

Made to exact OEM specifications for durability and precise fit in the countershaft area. Ensures proper sealing under high-stress off-road and street riding conditions.

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