Hello everyone I am new to this forum and have heard it is one of the best, which is why I came here to ask you all for help. I have a 2003 YZ450F that was just rebuilt. The bottom end was redone bearings and all. The bike just will not run. It is dead on timed, it has spark (or when the plug is out of the cylinder and i kick it over it does) and it is getting fuel. for some reason even with those three things, it barely will ever even pop when i kick it. i am all out of guesses and am hoping you guys can help me. It has a lot of compression too. Anyone ever have this problem before or have any advice on things to check? all connections seem to be good. I have tried everything and am all out of ideas.