Despite the fact that carburetors are fast fading from the scene, there are literally millions of them still in use. I’ve no doubt they’ll remain so long after I’ve gone to a home for doddering old mechanics. In the main, most carburetors work fine most of the time, but occasions sometimes arise when a little surgery is needed. Hence the popularity of the jet kit. While re-jetting a carburetor may seem like a daunting task—especially if your only contact with one has been turning a twist grip—it’s actually straightforward. Here’s the 411. What’s a Jet Kit? This may sound like an obvious question, but if you’ve never purchased one, how would you know? A jet kit is a comprehensive assortment of jets that allows you to reconfigure your carburetor’s fuel delivery either to suit some specific purpose such as the installation of an aftermarket exhaust or airbox kit, or to correct some deficiency in the way the bike runs from the factory. As a rule, along with the hardware, you’ll receive some pretty thorough instructions and in some cases a credit slip for a free dyno run so you can be certain you’ve selected the optimal combination of jets for your appli...