I have switched out my Main Jet on my 07 YZ450 twice now and both times the entire tube that the main jet screws into comes out with it (cant just screw out the MJ) Is this commen? I have a 05 YFZ450 and had a YZ250F (same carb I believe as the 07 YZ450?) and never had this happen. I am just curious if this is normal and also do you just screw it back in all the way? Like I said I have never had this happen before so I don't really want to be messing anything up in the carb.