First od all, check to see if you have gas in the carb bowl. Place the petc0ck in PRIME then open up the drain screw on the bottom or side of the float bowl and be ready for gasoline coming out--Hint: some small container to catch all this fuel
If you have a steady flow, then proceed to next step. Does it smell like raw gas coming out of your muff during the cranking of the starter?
Yes--check to see if you have spark on the sparkplug
No--turn the pilot air screw in all the way or 3 turn out and try to see if you can get the Beast running.
That is how I did the last time my beast decide not to start after I remove the carb to do the half spacer+main jet mod. Good luck