Jet kits don’t help, because fuel injection systems don’t use carburetor jets - they use computers and, more specifically, fuel injection “maps” to adjust the fuel/air mixture to optimize performance. Increased flow results (along with increased noise, typically), and your stock fuel injection settings do not work properly. Not surprisingly, a similar problem arises when you take your fuel injected motorcycle and exchange its exhaust system (and/or air filter) with an aftermarket unit.
Fuel injected motorcycles (particularly, among sportbikes) are rapidly becoming more common than carbureted bikes. Well, things have turned on their head a bit. As a result, “jet kits” are offered by the aftermarket for various motorcycles, principally by Dynojet and Factory. It is not something you want to try from scratch, without the benefit of knowledge gained by an expert matching your aftermarket air filter and exhaust system to the correct carburetor jetting on a dynamometer.
Rejetting a carburetor is a bit of a black art.
