I've got a 2000 426 that I was jumping yesterday and after about 10 jumps (no hard landings) I noticed some smoke coming from front of engine. After further investigation it appeared to be a small amount of oil dripping from the black tube at the front of the frame. I assume this is just some sort of overflow tube? It was just a slight drip but I figured when I was jumping it splashed on the engine which caused the smoke. Should I be worried, is this normal? My 99 WR400 has never done this. I checked oil level and everything was fine. Any ideas?