I have a 99 CBRF4. It's always ran good except for once the plugs went bad, no biggie. The battery has been dead all winter, I replaced it the other day and the bike fired up and ran good. I have started it several times trying to run out the old gas. It ran good everytime. Yesterday I started it up and it ran for about a minute, I walked off just letting it run and it died. I went back to start it and up it wouldn't start. I thought maybe it had flooded. Tried again last night and nothing. Got up today and pulled the plugs, looked ok. Cleaned them and reinstalled. Still nothing. Thought it was possibly the fuel filter so pulled it off and it wasn't bad either. Anyone have any suggestions?!? I'm lost now and this really sucks! Thanks in advance!!

 

Have you put "new" gas in yet? If you're trying to run the old stuff out, it might be at the bad layer of fuel that contains water from condensation.
Good Luck!
RB

 

I poured the old gas out and put new in, still no luck. Maybe gummed up carbs from the old gas. It was idling fine until it died though. I'm lost!!

 

The carbs could be gummed up... have you tried squirting some gas down directly into the bowls and see if it will fire up and run for a second of so? Are you sure it's getting gas? The fuel pump priming and doing it's job (aka, it hasn't gone bad?)?

 

I can't tell if it's priming or not. In the morning i'm gonna try pulling the fuel line off the output side of the fuel pump and see what's going on.