Im thinking that running the fuel tank empty pulled crap (water/dirt/debris) into the carbs.
The plugs are fouled with this unable to burn mixture of nastiness. The cylinders are as well from repeated attempts to start the engine.
Clean tank, filter and carbs(physically remove them and clean them inside and out- yes, all THREE things) . While doing so have the spark plugs out and the cylinders fogged with starting fluid (ether). Let the cylinders air out while doing the other work.
NEW fuel, NEW plugs (NOT cleaned ones). FULLY charged battery
If this advice is followed, the bike should start.
FZR 600-Suddenly wont start-video?
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Re: FZR 600-Suddenly wont start,backfiring??
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http://www.youtube.com/user/reelrazor
“A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.”-Douglas Adams
http://www.youtube.com/user/reelrazor
Re: FZR 600-Suddenly wont start,backfiring??
Wow thanks sounds good! Gotta start working with it tomorrow:) 
But why it didn't start with new plugs and with starter fluid?

But why it didn't start with new plugs and with starter fluid?
Re: FZR 600-Suddenly wont start,backfiring??
it wouldn't start because water, bad, gas, and other junk like reel razor said was already inside the carbs. therefore started fluid couldn't mix well or get past it to reach the cylinders.
Re: FZR 600-Suddenly wont start,backfiring??
Well now the carbs are cleaned,new gas, new plugs and also checked the tank but it was clean. I tried using motor starter and without but no signs of life.. Same little sound that sounds it almost starting but no.
But what i discovered was that it backfires thru carburator/air filter, why's that? Valves?
I remembered that it made same kind of thing after few days of use, not backfiring but did not start and just sounded like starting but not. But then it just suddenly started after few minutes of trying, but i noticed that were a power loss. But next time when i drove it was ok again.
But what i discovered was that it backfires thru carburator/air filter, why's that? Valves?

I remembered that it made same kind of thing after few days of use, not backfiring but did not start and just sounded like starting but not. But then it just suddenly started after few minutes of trying, but i noticed that were a power loss. But next time when i drove it was ok again.
Re: FZR 600-Suddenly wont start-video?
Trying to start the bike but no progress.. in video u can hear like its almost starting but not..

Re: FZR 600-Suddenly wont start-video?
Try putting those podt filters back on the carburetors. That might help out if nothing else seems to work then I'm pretty sure it is your valves
Re: FZR 600-Suddenly wont start-video?
They were off because i was spraying crc motor starter, but it didnt help. Well gotta check the valves..
Re: FZR 600-Suddenly wont start-video?
Have you checked your fuel filter yet? Did you check the gap on the spark plugs? The only thing I can hear in the video is the starter.
'92 fzr butchered (worked on) by previous owner
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Re: FZR 600-Suddenly wont start-video?
that bike is so beautiful, if it doesn't start, put it in your living room and enjoy the view!