Hi @Jestus, You are describing the sound that the engine makes exactly! My XT is a 2014 model and it makes the same noise. (It sounds like a worn dry ball bearing when you spin it fast by hand.) When you blip the throttle while the bike is idling on the sidestand, you will hear an increase in the noise. I have found that the sound only goes away when the bike is upright or when I lean it to the right. I think that it is a bearing in the transmission making the noise, because when I engage/disengage the clutch the noise also sometimes changes. My solution to the problem? I only start the bike and warm it up when it is upright! Seriously though, my bike has done nearly 25 000 km (about 12 000 miles) and THE NOISE hasn't gotten any worse over time. So I have decided to ride it until something breaks so that I can find out what the cause of the noise is The XT250 apparently has a good track record of reliability, so let's see if it's true. I hope my input will set your mind at ease. Cheers, bikematix.