Carburetors have stood the test of time because they get the job done and they’re cheap to make and straightforward to set up. They may look complicated, but carburetors are pretty simple devices. They just rely on intake vacuum, created by the piston moving down in the cylinder, to draw fuel up out of the float bowl and into the combustion chamber. That’s a super-simplified explanation of how they work, but the point is that a carb’s function is strictly mechanical. That’s both a blessing and a curse, though, because while carbs don’t need electricity or separate systems to do their job, their function, and thus the running of your motorcycle, is affected by things like air and engine temperature, elevation, and other outside factors.