?????? does anyone have any idea's a friend of mine has a 03 450es with a no start c/k for fire and yes it's getting fire c/k fusses there ok c/k carb. float + main jet there ok what next. please help.

 

Check to see that fuel gets to the float bowl. Open the drain at the bottom of the float bowl and make sure gas gets there.
Then try starting at 1/4 throttle, this bypasses the idle circuit, and then if the spark plug looks wet...check the compression.
Have you tried a new plug? Did you pull the plug out, and hold it against a ground, and crank, and saw spark?