The last two oil changes I overfilled it. It says it takes about 3/4 of a quart on an oil change? The first time I put a quart in it this time I put less than a quart in it. I am way over the sight glass. However it hasn't puked out yet even with all those hill climbs. I haven't seen any bad results. I feel guilty just adding over half a quart on a oil change. Maybe I need to get use to it or use the oil level screw next to the sight glass. The 07-11 always took a quart any more and they would puke out oil from the breather tube. Dang, you sure you're draining all the oil out? Sure there's not a 2nd oil plug? My KTM has 2. It's just, dayum, just over a half quart of oil?