So I purchased a 2000 wr400 a few months back. Its been great and a helluva learning experience. But I noticed pretty soon after a couple days riding that it has to have some sort of oil leak. It goes from the full line on the dipstick to about the middle of full and low within a week, riding about 35-45 miles m-f. Oil seems to be coming from somewhere in front of where the swingarm pivots. I searched and apparently its common for it to leak from a seal behind the front sprocket. But I check that and its fairly clean compared to the areas that are actually wet with oil.. Most of the oil collects on the bottom/rear of the crankcase area. Its not coming from the oil drain plug either as its clean several inches behind it. I also thought maybe it was coming out of one of the several little drain tubes that come down in front of the swing arm. But they actually hang lower than the swing arm pivot point and appear to drain fuel not oil? Anyone got any other ideas? I fear the actual crankcase liquid gasket has deteriorated to the point of leaking or maybe the right side crankcase gasket? Are there any other common leaks on these engines besides the seal behind the front sprocket? I know the crankcase breather tube can make a mess but I hardly can believe that tube could cause all this.