fuel line or fuel filter
If it was the ignition you the bike would start to shut down when hot generally.
Blast doesn't have an external fuel filter, but you can try running with the fuel cap cracked open to rule out a clogged vent line. Generally the fuel line itself won't clog, but its common for the vent line to clog and not allow gas to flow freely.
so, I apparently spoke too soon. I was able to ride it around the neighborhood when I declared it the wire but I replaced it and still nothing. My super boot also came in and I replaced that with no effect. It'll start and idle, but when I give it gas it almost seems to misfire, backfire a little, and almost seem like it's locking up before dying.
At this point I think I'm just going to keep working my way back but I have no earthly idea how to isolate this anymore.
I am going through he same issue right now new plug the super boot, and it starts but not the normal high idle, then given throttle it dies right out.
Check your tank vent and hose - try riding with gas cap off for a bit - if no problem then the vent and hose are suspect.
EZ
Ezblast, thanks for the suggestion, I tried with the cap off and it still had the same problem. Also, I was completely unable to ride, any sort of throttle or load caused it to sputter and die.
Short story, runs now.
Long story, I tore half the bike apart, poured out everything I could from the carb hoping maybe there was just some water in it, I also disconnected the TPS and auto-enriching circuit just in case and started her up. Gave the same problems so I tried revving it a bit, sputtered and such as it had been there was a nice pop and it runs fine now. I'm hoping it was just something ridiculous clogging something.
I'm going to run some carb/injector cleaner through the gas and probably next weekend plug the TPS and choke back in and make sure it keeps running just to be sure.
FWIW, my brothers blast suffered the same symptoms. We after much chasing found the fuel (ethanol mix) separated in the tank, at first we thought it was water from a leaking cap/gasket, but after replacing both and it recurred. on a lark we lit the "water" on fire and it burned! He started using 100% gasoline and had no problems except when using "gasohol". leaving a partial tank in the bike always led to problems within a few weeks requiring a tank drain when the level of alcohol reached the bottom of the main pickup diluting the fuel to the carb. the only thing we figured is the vent is stuck open and drawing in enough moisture to cause the alcohol to come out of suspension. we live in East TN with miserable high humidity, and we attribute it to this, that's our best explanation after a year of playing with it. i hope it is of some help to someone. He has stopped riding it and we haven't replaced the vent. but a full tank pretty much stopped the issue.