ive had this problem twice. on my old bike it was because i had a leak on one of the four short fat hoses that connect the carby to the engine. also backfired so i replaced the leaking hose, cleaned the whole carby and balanced all four carbys. ran great.
on my current bike it has a problem with similar symptoms without the backfiring. but its because i havent started the bike for over a year. i have to jump it and it still runs dead. too lasy to diagnose it but could be battery or dizzy like others have said. plus have to flush out the oil and old petty before i try anything.
also could be the regulator, alternator, short somewhere in the electrics (happened to my bro and he couldnt go over 3800rpm without stalling). check the fuses, earth etc. dont forget to check the main fuse next to the battery.
what does the bike idle at, over heating? happening when cold?
these bikes always have problems.. especially the carby but goes hard for a 250
btw if you just sprayed carby cleaner straight into your carby, change your sparkies. it wouldve fouled it up
and if your still stuck, go on cbr250rr forums... or to a mechanic lol
hope that helps
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