Dirtbike problem need help

I have an xr100r and i noticed it was smoking alot out of the exhaust today so i took a look at it and the smoke smelt like something burning an i noticed a small hole at the bottom of the exhaust pipe blowing smoke out also and ther was a black oily liquid leaking out of the hole and i dont know what to do. Plz help
 
I have an xr100r and i noticed it was smoking alot out of the exhaust today so i took a look at it and the smoke smelt like something burning an i noticed a small hole at the bottom of the exhaust pipe blowing smoke out also and ther was a black oily liquid leaking out of the hole and i dont know what to do. Plz help


Check the oil often!!
 
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