Its all to do with the environment. They say thats carbs on any engine are bad as when the throttle is closed they still put fuel through the engine, and as its not doing anything (ie not driving the wheels) its wasted!!

So now with the new fuel injected bikes they have been trying to basically find the best compromise for when you turn the throttle off how much fuel is put into the engine to keep it going but then also not waste too much. Theyve came up with so many different ways to check/monitor this. This isnt as bad on a 4 cylinder bike where a change in the fuelling will automatically come in and because the pistion sizes are very small dont create a huge amount of punch.

Do this on a big single or a twin and your bike with lurge or surge forward. Its like the bike is putting on and off the throttle ever so slightly with out you doing anything, all in the sciene of saving the environment for that last few mpg/carbon whats its per kg (dirty stuff from the exhuast)

How do you fix it?

There are a few different ways but they all are basically trying to trick the fuelling system into doing what is best for the rider and not the environment

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Plough on