The booster plug for this bike, is an easy way to richen up the air/ fuel mixture from just off idle, to 100% throttle.  This provides enough fuel, to work well with our open end cap and opened up air box.  It's easy to install, as it just plugs in between where your "intake air temp" sensor goes, in the the top of the air box.  It puts the A/F ratio around 14.5:1 up until 8000 rpm, where it runs at 13.5:1.  All safe, good zones

Booster plug for 2019-21 KTM 390 Adventure

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    Best Dual Sport Bikes designs performance aftermarket parts for KTM and Husqvarna brand bikes. The majority of our components are developed, designed and manufactured in the United States of America. Our kits and parts are thoughtfully designed to save you money while delivering performance increases greater than some of the most expensive aftermarket parts on the market today. 

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