The way I'm reading this, he's saying it's too much power, the bike is running fine. Just too much for where/how he now rides, i.e. all the low/mid range the Ivan's puts back. If that's the case either put it back totally standard with all the holes in the power curve or perhaps he needs a different bike better suited to how/where he rides nowadays.
A fair few of my customers have moved to less powerful machines as, let's say they've aged.
A fair few of my customers have moved to less powerful machines as, let's say they've aged.
Later