I am betting your carbs need to be cleaned and cleaned thoroughly.
Make a compression test on 2 cylinders, http://www.youtube.com/watch?v=cdif7gaWDLc
SOURCE: Honda, 80 elite with 41
First make sure that the bystarter is indeed functional: look at it, it should move when powered. Simple test to confirm that: remove the screws that hold the unit into the carb, and lift the choke slightly out of the carb body while cranking the engine : if it runs, then the carb is ok, choke is not. If necessary remove the air filter, put your hand in front of the carburetor to choke it even more and then start the motor.
If the engine dies even now then the problem is in the carburetor: either the idle is badly adjusted or the level in the bowl is too low.
SOURCE: have a honda crf100f 4cycle got spark wont start,
CLEAN THE CARB AGAIN IF IT RUNS ON STARTING FLUID ITS NOT GETTING FUEL YOU WILL NEED TO REMOVE THE JETS AND MAKE SURE THEY ARE CLEAR
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