Got an old bike that’s not running right? The carburetor may very well need a cleaning. The carb is tasked with supplying the engine with fuel and air in a very precise ratio, and to do that it relies on numerous small passageways and orifices. Sometimes though, those little holes get clogged, and when they do your bike may have a hard time starting or may not want to idle. When that happens, it’s time to give the carburetor a good cleaning.