If you have any performance modifications installed on your bike: (Aftermarket Exhaust, Air Filter, Race Fuel, Emissions Delete, Cam Shaft/Timing Upgrades, Etc). You Need the vehicle's fuel injection system to be adjusted(Tuned). The basics of tuning a motorcycle start and end with the amount of fuel the combustion chamber receives per every revolution of the camshaft. This is done via the fuel injectors. Having a professional go in to adjust the fueling per the specific performance setup will allow for the Best Possible Run-ability and Performance of the vehicle through All RPM's and Throttle Positions. This is just the start and most basic of the tuning process on Most New Generation Fuel Injected Motorcycles.