I just changed the oil in my GPX250 on my own for the first time. All went well, however I do have one question. In the manual it says that my bike takes 1.9L of oil. When I filled it, I first filled it towards the top of the sight glass, started the bike to get the oil into the oil filter, and then checked it again. I topped it up to the top of the sight glass again, and now I think there is enough oil in it. However, I only put in approx 1 and 3/4L of oil in it . It is at the top of the sight glass. The last time I had the oil changed was by my mechanic, and I measured the oil roughly in my oil change pan, and it looked to be about 1.9L so I not sure. The oil always covered all of the sight glass and I couldnt see the level less I tilted the bike a little. I was just wondering of i should leave it at the current level, or fill a little more to make it 1.9L?