O-Ring for studbolt

Vortex Studbolt O-Ring
This genuine Vortex O-ring is intended to seal the studbolts securing the cylinder head on Vortex 125 cc engines. It ensures proper sealing between the head and the fastening bolt, which is vital for compression integrity and durability under racing conditions.
Compatibility: Fits all Vortex 125 cc engines.
Application / Position: Installed around the head stud (cylinder head fastener) to create a seal against pressure and thermal stress between cylinder head and cylinder.
Installation / Use: Clean sealing surfaces, ensure the O-ring is undamaged and seated correctly before fitting the stud and head with correct torque as per Vortex technical instructions.
Specifications & features: 
OEM Vortex part number W627.
Provides efficient sealing of head‐stud interfaces and contributes to increased top‐end stability and engine reliability.