The SX/XC dome gives a big midrange boost with more power throughout the power curve. It is best suited to tight tracks with lots of jumps out of corners and woods riding.

The MX dome greatly improves top end power and overrev. This dome works best on fast, flowing tracks. Both domes feature combustion chambers that are fully optimized (compression ratio and MSV) for their specific riding conditions and have a nominal squish clearance of 0.035”. The OEM cylinder head leaves a lot to be desired (see our FAQ), and it’s large squish clearance can lead to jetting woes, detonation, poor fuel economy and throttle response, and less power. The Apex Technical Innovations head solves all of these issues while giving you an increase in performance where you need it most. All of our standard domes are designed to run on pump gas, but we can accommodate requests for race gas domes or for those at high altitude.

Note: this kit does not include oem orings.