did the bike sit with fuel in it?

Sounds like the carb could be gunked up...id try a rebuild...fix the issue of no spark...no fuel and no spark...youre fucked.

also check the fuel pump...are you getting it to prime? Is it even working...hows the filter on it?

start with the basics...diagnose the spark issue...which you have seemed to do...replace the box.

then go down the fuel route...check the carb and check the pump...pop the fuel tank off and clean it out..make sure there is no rust in it to prevent further clogging!