Hello all, I just got a new 2014 WR450 about a month ago. I haven't had a dirt bike for about three years and am getting back into it. This is my first brand new bike and I did all the necessary prep before riding and breaking it in, feels good to know that it's done right! I'm curious to know what the hole in the cylinder head shown in the picture below is and if it should be plugged. I read through the manual and it makes no mention of this hole. Can anyone give some insight to this?