I installed the tec insert to my 03 yz 450f and lost all bottom end. My jetting was perfect before insert was installed, and now i cant seem to get it runing right. I have adjusted the low speed fuel screw. Once you get it wound up it will run ok but I just cant seem to get it to run right.The only reason for install is to be USFS compliant! Has any one ever ran one of these?