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I recently bought a 1999 f4. It does sit outside and the other day it was rainning. I waited until it stopped rainning and went to go ride. The bike started with no problems then i drove down my driveway and it died. I couldnt get it started without holding the throttle wide open. Its back firing and black smoke is coming out every time it fires. Ive been told the air filter could be saturated or something clogged in the carbs. Any suggestions before i take it up to get the carbs cleaned for $500? Please any input would help.  

Sounds like you may have a hung needle valve.  Get a screw driver and tap the float bowls lightly with the base with the bike running.

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'99 CBR 600 F4 Silver, Carbon Fiber Grips, Levers, Mirrors, Stainless Steel Muzzy Slip-on, 520 Stealth sprocket set 15/47, Factory Pro Stage 1 TI jet kit, Reverse Indiglo Guages, Goodridge SS Brake lines, Custom Carbon Fiber Seat, rear turnsignal eliminator, rear brake LED Bulbs, F4i Rear Shock

'87 Yamaha XV1100 Virago Black/Red Fireball, Mac slash-cut pipes, custum air filter, clear turn len's, Lots of Chrome

I really cant keep it running. Right now all its doing is blowing flames adn black smoke.

did the bike fall over.  pull the fuel tank and check the airbox.  maybe full of water or oil.

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'99 CBR 600 F4 Silver, Carbon Fiber Grips, Levers, Mirrors, Stainless Steel Muzzy Slip-on, 520 Stealth sprocket set 15/47, Factory Pro Stage 1 TI jet kit, Reverse Indiglo Guages, Goodridge SS Brake lines, Custom Carbon Fiber Seat, rear turnsignal eliminator, rear brake LED Bulbs, F4i Rear Shock

'87 Yamaha XV1100 Virago Black/Red Fireball, Mac slash-cut pipes, custum air filter, clear turn len's, Lots of Chrome

I just checked the air filter and it seems fine. I tried starting it without the filter and still doing to same thing.

Replace your spark plugs.

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'99 CBR 600 F4 Silver, Carbon Fiber Grips, Levers, Mirrors, Stainless Steel Muzzy Slip-on, 520 Stealth sprocket set 15/47, Factory Pro Stage 1 TI jet kit, Reverse Indiglo Guages, Goodridge SS Brake lines, Custom Carbon Fiber Seat, rear turnsignal eliminator, rear brake LED Bulbs, F4i Rear Shock

'87 Yamaha XV1100 Virago Black/Red Fireball, Mac slash-cut pipes, custum air filter, clear turn len's, Lots of Chrome

So i replaced the plugs and it starts but its backfiring really bad still. I have to keep the throttle open in order to start it. I dont keep it running for very long because i dont want to burn up a piston if it is leaning out. whats next? Probably carbs clogged?

ya thats what i would do.

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'99 CBR 600 F4 Silver, Carbon Fiber Grips, Levers, Mirrors, Stainless Steel Muzzy Slip-on, 520 Stealth sprocket set 15/47, Factory Pro Stage 1 TI jet kit, Reverse Indiglo Guages, Goodridge SS Brake lines, Custom Carbon Fiber Seat, rear turnsignal eliminator, rear brake LED Bulbs, F4i Rear Shock

'87 Yamaha XV1100 Virago Black/Red Fireball, Mac slash-cut pipes, custum air filter, clear turn len's, Lots of Chrome