Yam ybr125 wont idle off choke,also cannot find idle control scre

minha yz426f quando vou de terceira marcha devagar mas quando eu acelero a fundo ela engasga , mas ? so de terceira marcha de rewsto nao faz isso

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Instructions

1. • 1 Open the choke by pulling the choke lever on the left handlebar control toward you. Set the bike on its kickstand, put it in "Neutral" and start it up. Allow the Road Star to warm up for about 10 minutes before continuing with the adjustment procedure.
     
   • 2 Locate the idle adjustment screw on left side of the bike just below the rider's seat. Twist the adjuster screw clockwise one full turn. This will ensure the bike stays alive so you can adjust it to the proper setting.
     
   • 3 Close the choke lever and listen to the engine carefully. Twist the idle adjustment screw slowly counterclockwise. You should hear the engine speed start to slow.
     
   • 4 Twist the idle screw counterclockwise until you hear the engine start to sputter and die. When this happens, stop and turn the screw one half turn clockwise. Your bike should now be idling at the correct speed.
     

There is no idle ajustment screw, the idle speed is computer controlled.

Did u put oil on the air filter? if thats ok then it sounds like you have a clogged pilot jet in the carb, pull the float bowl and remove jets then poke thru with fine wires untill clean. also take note of air mixture screw which will be located around the opening of the carb. clockwise will richen it up and start to make the idle drop and counter clockwise will do the opposite.

John replace the idle jet $5.00 at a Yam. dealer (don't try to clean it ) & make sure that the idle mixture brass screw on the bottom of the carb is set 3 1/2 turns out from lightly seated. (don't break the tip off)

This is a classic example of a clogged pilot jet in the carburetor. You need to clean the carburetor circuits and jets.

This could be due to timing screw being incorrectly set
Locate gold timing screw on the carbrettta turn it clockwise only slightly till bike idles without choke on, Then when choke it on it should idle a touch higher.

first drain the carby, then set your air mixture screw 2 turns out, from the fully turned in position. The starting proceedure is as follows, when the engine is COLD, turn on fuel, pull on the choke fully, and kick the engine over. DO NOT use any throttle, when the engine is cold, and the choke is on. Remember Choke on, NO throttle.
When warm, no choke, and a little throttle when kicking.

hi,sounds to me like the air fuel ratio is all up the ***,locate the air/fuel screw on the carb(normally on the side)screw the screw right in untill it stops,then back the screw out 1.5 turns,this should get the bike to run without the choke,once you have the bike running simply turn the screw in or out untill the bike settles into a nice steady idle,should be good to go,hope this helps...cheers

Pull the carb off the bike and clean it inside and out. Be sure main jet is clear. Remove the two screws on the outside throat of the carb and spray into the screw holes as well. Be sure to put these two screws back in the same hole they came out of. IMPORTANT > > > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward.

Put the rest of the carb back together and install the carb. Turn the gas on to let the float bowl fill then start the engine. Chances are this will fix the problem. I suggest that you install an in-line fuel filter to prevent this happening again.

Last item> You should have just a little bit of slack in the throttle cable where it goes into the top of the carb. Not more than 1/16". Let me know how things turn out.

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