FZR 250 2KR starts to run like **** over 85-90km or 9500rpm, the air box had fallen to pieces so replaced with pod filters, the muffler had fallen to pieces so my friend built me another but just staight through. Others have advised i may need to re-jet my carbs, but it almost floods itself at low rpm unless you give it a couple revs when taking off. Advise please? Thanks for the help.
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SOURCE: My FZR 600 is acting up and backfires
I have had several bikes in my time. and keeping the carbs syncranized is very important. Did you put aftermarket pipes on it? try rejeting the carbs up 2+mm that may help the fuel air ratio?
SOURCE: intermittent misfire/loss of power at higher revs..
how are your intake and exhaust valves? are they set to specs? my racing quad use to do that. so i set the valves to spec and whala!!!!better than ever.
SOURCE: TTR-125 Won't Start
unscrew the four screws on the bottom of the carb (be ready some gas will drain out) then you will see a goldish looking screw. unscrew it that is your jet
SOURCE: my fzr genises misfires at 4000 to 5000 then wont rev past
Have you checked if the EXUP valve is working? It should cycle when you turn the ignition on.
If it's stuck in the closed position it will be choking the engine in the way you describe
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