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Looking for a simple, cost effective way to richen the fuel mixture on your stock bike or those with exhaust/air cleaner upgrades? Nightrider.com's Patented lambda shift technology has been updated and improved. A simple LED display provides Rider feedback on the fuel mixture range at the O2 sensor A single dial is used to set the target closed loop AFR Simple Plug-n-Play installation Most Riders only make minor upgrades to their bikes, like exhaust and air cleaner changes, or leave the bike completely stock. Within the scope of these modifications, modern closed loop ECMs are capable of maintaining OEM fuel ratio's. While this ability to correct the fuel mixture will prevent an engine from technically becoming leaner than OEM specifications, it often exaggerates the annoying habits the stock bike exhibited. Low RPM Engine Surge Poor Throttle Response Tendency towards Engine Ping Excessive Engine/Exhaust heat are some of the common complaints of OEM tuning with or without exhaust and/or air cleaner upgrades. Some fine tuning of the fuel mixture and adding 2>9% proportional fuel across the RPM/Load range will reduce or eliminate these situations for the average Rider. The AF-XIED specifically was designed to do this. Using the AF-XIED to fine tune the closed loop fuel mixture using proven lambda shift technology is as simple as it can be. The AF-XIED plugs in between the OEM O2 sensor and motorcycle wiring harness using our Harness Adapter The AF-XIED plugs into the Harness Adapter Set the AFR Dial on the AF-XIED Tie Wrap the AF-XIED and Harness Adapter into place You are ready to Ride