I have the same issue with mine, and as far as i can tell that just what this bike does. i havent heard of any fix. just let it warm up slow and dont ride it will the head is hot that will keep the leak from getting worse. since the engine is make with two different types of metel their expand points are different and if rode before warmed up it will cause this leak to increase. i use TSP oil treatment in the transmission. really think %!ยค and it leaks really slow so you dont have to top it off as often. hope this advice helped in some way