Questions & Answers for: Yamaha YZ 250 F idle screw

I start the bike and warm it up and push in the cold starter knob the bike will not Idle. please help. turn the idle screw in and check the setting on the air fuel mixture screw. is the bike all stock

...idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well. The diagram below depicts the problem area. The bike will idle properly once the pilot jet and ...

...screw on the right side of the engine with a flat head with the bike running it is suppose to bring the idle up or down... if not then take it to a mechanic before your engine blows. I to have had ...

...200 to idle properly. I changed to plug and cleaned out the carb. it revs fine but when it slows to an idle it just dies off. help?? simple just turn the idle screw in 1/4 of a turn mate and its ...

...2005 yz 250f? Idles too fast, pops ok buddy on the carb will be 2 screws turn the idle one out to lowen idle and screw the mixture one in 1/4 of turns until it stop backfiring and thats it

...a backfres for a while then goes way then comes back You have a plugged pilot, or idle jet, and possibly your exhaust header is loose. Adjust your fuel screw to 2.5 turns out and try it. Chaz Moto ...

then just turn it about a quarter turn at a time untill u find the right spot. (my '07 likes it at 2.5 turns out) good luck and also you may have to readjust the idle screw when you move the air screw

...idle only in choke, and would back fire if I accelerated, SOLUTION: you have to adjust a little screw that controls ur fuel input. I did it and it fixed the problem, try it before cleaning ur

the bike wont idle my yzf 250 run but will not idle Try cleaning the carb or air filter do you have a idel screw

...idle screw and still not helping could it be the jetting? When you say you've "played with the idle screw", do you mean the idle MIXTURE screw, or the idle SPEED screw? Also, it COULD be the throttle ...