What NOW!! Loud backfire,Virago no start

[bauhaus1100]

Hello all,
Me again, I don't know what is up with my virago this year. I finally got her running with a new starter, new starter gears and clutch.(thanks in part to marki) She was running great, started better than it has in a long time. Today all of a sudden the headlamp does not work. It started fine all other electrical is in order, the fuses in the instrument panel are good (havn't checked under the seat fuse) I bought a new bulb, to no avail. So then I put her all back together because I had to run.....and the headlight works!!!! Now the bike won't start, just turns over and mad a hell of a loud backfire, it scared the crap out of me > so here it is again, I thought I had it licked then this happens I am in despair

[T1z3R]

check the battery terminals are clean (no corrosion) and tightly secured.
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duck my sick!

[bauhaus1100]

Battery is all good, I have no issue with juice.