you need to go thru your stuff.
a motor needs air, fuel, spark to run.
i read your other thread. your going to have to work on it.
does it have spark?? is it good spark, your carbs cleaned up good??
like other said you need to check for air leaks.
i bet when you figure it out it will be something very simple.
what jetting you running. i would put your timing at 4 deg. sometime you should do what your motor will like not what some suggest cause theirs liked it.
i dont think its your compression and squish causing it to not run.