hi all. i have a 2001 250 r ninja.got it used.adjusted valves,new gas,oil,bike never started good at all.now hard to start. when it does start after warm runs good down the road.but idle is never great.up and down.i cleaned the carbs all jets are clean.but with choke on the bike will not start good at all.a lot of poping but still not starting good.new plugs.the air screws are set at 2 1/2 out.any ids will help.just ordered a sync set to sync the carbs.
If you are having popping noise, it sounds like you may have some carb or exhaust mods or both.
What is your idle speed?
Do you have pod filters or an airbox?
Do you know your main jet sizes?
How is your bike stored?
Have you ever tried Star Tron Fuel Treatment? - This will help with the E-10 gas and the humid conditions in your area.