Athena R&D Department has developed a new '' Dual Spray Venturi Jet'' which redirects fuel flow , improves throttle response, eliminates 99% of all bogging, increases bottom-end performance and improves fuel efficiency. This new carburettor kit works with fixed or adjustable leak jets and includes all necessary additional parts as well as complete easy to install instructions. It can be applied to all KEIHIN FCR-MX carburetors.