Expansion Chamber Seal kit for 2-Stroke 50cc Euro Dirtbikes 

Kit fits the following 2002 & Up 2-Stroke 50cc KTM, GasGas, & Husqvarna Motorcycles. 


***2002 & Up KTM SX & Adventure 50cc
2021 & Up GasGas MC50
2017 & Up Husqvarna TC50

OEM # 45105057000 17/20mm Expansion Chamber Seal 



Kit replaces old factory parts with fresh springs, o-ring seals, and pipe to silencer coupler. Replaces OEM # 45105057000 sleeve that measures 17/20mm only. 

***Excludes all the following: 2001 50 SX Pro Senior LC 2002 50 Junior Adventure 2002 50 Mini Adventure 2002 50 SX Pro Junior LC 2002 50 SX Pro Senior LC 2002 50 Senior Adventure

  • Kit configured to re-seal stock or aftermarket pipe with proper new swivel hook springs, "O" Rings, and hi-temp silencer to pipe coupler.
  • Replaces factory equipment with exact fit quality parts.
  • Kit comes complete with what you see.
  • Designed to fit 50cc KTM 50SX 2002 & Up, Husqvarna TC50 2017 & Up, and GASGAS MC50 2021 & Up
  • Complete set, nothing else needed to seal up your two stroke exhaust pipe.