JSP BILLET COOL HEAD / JSP ALL OUT MX HEAD INSERT

The ultimate solution to maximize cooling and bring out the full performance of your engine. Custom 5.2cc billet insert. Maximizing the full power of your race engine with more over rev and mid/top end power for those wide open outdoor tracks. Housing a smaller 10mm spark plug optimizing combustion efficiently. Smaller squish band requiring the cylinder to be raised 0.2mm-0.3mm over stock height. NOTE- Requires NGK LR8B spark plug Oem O-ring kit sold separate