I just replaced my 7 year old sons jr50 with a new ttr50e. The first day he rode it I found oil in the airbox.(about 2hrs on it) I first thought the guy at the shop over oiled the filter so I cleaned it up and put it back together, checked the oil and figured all was well. Bike started running rough last week so I checked it over and found Oil in the airbox again (4-5 hrs on it) I checked the oil per the owners manual and it was still on the money. I haven't had to add any oil at all since he has had it. I took it back to the dealer and it sat there for a week. They checked with yamaha and looked the bike over and found nothing. They told me to have him ride it more and see if it does it a third time... So I am lost as how oil could be going back through the intake into the airbox and even more stumped as to how the oil level is still right?? Anyone else having the same problem?