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Check your fuel filter is clear, although as its only 2 years old shouldn't really be a problem but that depends on how good the fuel is. Also check the fuel tank itself is "breathing". Run the engine for a while and open the fuel flap and listen. Do you hear a sound of air being pulled into the tank. If so it isn't breathing and the breather needs clearing (I took my fuel cap to pieces and cleaned before replacing). If it stalls out after idling for a few minutes, try idling with the fuel cap open (be careful though) to see if it runs fine.
When you cleaned up the carbs did you also clean out the low speed idle jets? They are the first thing to plug up when your bike sits with out gas stabilizer in the tank. The bike runs great at speed but will not idle properly.
It sounds like its time to have the carbuerator cleaned more then likely you have some varnish build up in the idle circuit. I cant remember if that bike has a fuel filter in line from the tank but if it does I would recommend changing that first as it could simply be starving the motor of fuel at idle.
I don't have a solution but I do have the exact same problem, '03 or '04 (not sure) Suzuki 250 Quadrunner Ozark,really low hrs, left in storage for 2.5 yrs, gas went bad, cleaned it out, now hard to start and won't idle by itself.
I have taken the carb apart and cleaned it out, but did not replace anything, and it will still not start very easily or idle. Before I took the carb apart I thought it was flooding because it would start with the accelerator wide open, but when I would let off, it would die again. Whats going on?? I really don't want to pay to have it fixed.
THERE IS ONLY ONE THING THAT WILL CUASE THIS, PLUGGED IDLE JETS AND PASSAGES. REMOVE THE CARB AGAIN AND SOAK THE CARB IN A STRONG CLEANER OVERNIGHT TO DISOLVE THE HARD WHITE RESIDUE THE BAD GAS LEAVES BEHIND, JUST RINSING AND BLOWING THEM OUT WILL NOT WORK IN MOST CASES.
Change the fuel filter,clean the carb jets again,and replace the air filter.This should take care of it but sometimes when they sit for awhile,you will need to clean the carbs numerous time as the gunk in the tank continues to wash down into the carbs.