HELP! I have a walk behind mower and I can't start it.Its a Kawasaki fb460v. This is what I have done: New fuel, new fuel hoses, new fuel filter, new carburator, new spark plug, checked for spark its good, removed the fly wheel to check if the timing move, its good and the shear wedge is good, removed the head to check if the valves were stuck and they are ok. i tried putting a little gas in the cylinder and nothing. I just ran out of options I don't know what to do next?