when i first get on it for the day and it's cold, it starts right up no problem, but after i've had it running for a little bit, even just 15 min, and it's warmed up, if i shut it off it won't start, it just keeps turning over with no fire. it smells like its getting fuel, so i assume it's the spark. it has an aftermarket cdi box, dynatek dyna 2000. anybody have any ideas? also, if i push start it, it starts right up, which makes me think the cdi or coils aren't getting enough power for some reason

 

Check your battery voltage as well as your battery connections ensure theyre tight, also check connections on your cdi.

Check your spark plugs as well, see if they're black.