about 3-4 rides ago, due for another one soon, thats not the problem though, this has been going on for a while, yes i go fast all the time, but it looks as though the oil tank, were you put the oil in is leaking, after everytime i go riding, when you look at the oil tank were the dip stick goes, theres a layer of oil going down the side of the tank under the hole. there is also a oil line at the top of the head were i have seen some oil sit, but am not excatly sure if that is were it is coming from. i will check the oil filter and others. thanks.