Hi, thanks for approving my application.

I have a 2017 Duke 250 which has a weird problem. Whenever I try to suddenly go fast, for eg : I was going at 40kmph at 2nd gear and someone crossed the road which forces me to slow down to around 20kmph, then upon trying to accelerate again, it would lag so much that it felt like it losses power completely for a while even if I rev hard. In a local language, it doesn't have a pickup. This doesn't happen if I go normally without slowing down, but I live in a hilly area with a lots of ups and downs.

The second problem is (probably relate to the first), when I go downhill in a gear without accelerating (using engine as a means to slow down), the engine always dies upon pressing the clutch when trying to shift gears.

My first suspects are either bad fuel pump, bad fuel injector, bad fuel quality or weak battery. Whats yours?

I know I am not very good at describing my problem, there's a lot of proper terms that I don't know (in English) when talking about vehicles. So, please bear with me and tell me anything you don't understand in my question, I will try my best to explain it again. Any answer is appreciated. Thanks