Question about 2002 Yamaha YZ 426 F

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Were is the idle screw? - 2002 Yamaha YZ 426 F

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On the side of the carb will be silver or brass

Posted on Sep 16, 2010

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Idle adjustment at carburator end


most older cars had 2 adjustments , a air screw for enrichment and throttle screw for engine idle speed, later models did away with the enrichment screw, to adjust set idle screw to 600 rpm, adjust air mixture screw to fastest rpm , reset idle screw to preferred idle speed.

Oct 03, 2016 | Cars & Trucks

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Set idling via screws


Most older cars had 2 adjustments , a air screw for enrichment and throttle screw for engine idle speed, later models did away with the enrichment screw, to adjust set idle screw to 600 rpm, adjust air mixture screw to fastest rpm , reset idle screw to preferred idle speed.

Oct 03, 2016 | Cars & Trucks

1 Answer

It idles fast if I turn the idle down it stalls running rich on top end at fast idle sometimes it will drop to a very low idle and shut off


adjust the idle mixture screws first and then adjust the idle speed screw to compensate
adjusting the idle mixture screws will alter the idle speed but when properly adjusted then adjust the idle speed screw,

Aug 24, 2015 | Motorcycles

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Setting the idle mixture, turn out screw till highest idling, then still turn out and the engin still idle smooth?


thats what happens when you change the set screws,idle set screws will bring it to an idle,when you are at that 1st point,where it idles fine,stop,your idle set screw is done

Jul 15, 2015 | Cars & Trucks

1 Answer

WEED TRIMMER CARBURETTOR ADJUSTMENT


Three screws. On some, there are only two screws. Some have only one screw. A few have none at all.

If there are any screws, one is nearly guaranteed to be an idle mix adjustment. With the engine warmed up & idling, turn that screw in (clockwise) 1/4 turn at a time until you can hear the idle speed drop a little. Back it out 1/4 turn and leave it alone. If the first 1/4 turn drops the idle speed, turn it OUT 1/4 turn and see if the idle speed rises more. When you get idle speed that stays the same when you make a 1/4-turn adjustment, go back to the beginning if this paragraph and repeat the first part.

If there are two or three screws, the next screw may be either an idle speed screw or a high mix screw. If it's an idle speed screw, turning it in 1/4 turn will immediately RAISE the idle speed and turning it out will LOWER the idle speed. Adjust that screw until the string head (that cuts weeds) isn't quite turning at engine idle. If it's a high mix screw, its only effect will be at full engine speed. If the engine sounds throaty, turn that screw in 1/4 turn at a time at full engine speed At some magical point, the engine sound should turn brassy. If you turn the screw in past that point, the engine will lose power because it's running too lean.

If there are three screws, then you have all three - idle mix, idle speed, and high mix.

There may be markings near the screws to identify them. Each manufacturer marks them differently, if at all. Some manufacturers simply rely on the screws' locations to indicate what they do. It'll be up to you to figure out which is which and make notes accordingly.

Aug 01, 2014 | Ryobi Garden

1 Answer

Saw will start but will not idle


Someplace near the carburetor should be an idle mix screw and an idle speed screw. There may also be a high-speed mix screw. Try turning the idle speed screw in 1/4-turn at a time until it idles. If you turn it too far, the clutch will always be engaged so the blade will never stop.

Once you get it to idle, adjust the idle mix screw in or out 1/4-turn at a time until it idles at the highest speed. Turn the mix screw in JUST until the idle speed starts to drop a little, then back it out 1/4 turn.

Now adjust the idle speed screw again until it idles smoothly at a low enough speed that the blade stops.

Jul 08, 2014 | Husqvarna Partner Gas Powered Cut Off Saw...

1 Answer

1986 dodge ram 225ci slant six and a single barrel holley carb


Start with the idle needle screw first, the idle mixture screw. Seat it all the way in, first-don't overtighten and damage it, just seat it lightly, and back out two full turns. Run the engine and set the adjustment by ear to get your best lean idle: start turning the screw in (clockwise) 1/8 or 1/4 turn at a time till engine stumbles, dies, or runs rough. Keep the engine running, and turn screw out (counterclockwise) a little at a time till you hear the idle dropping. Now between those two settings is your best lean idle. Turn the screw in, a little at a time and wait for engine to respond, tiill you get the highest idle speed. Now set the other idle screw, curb idle, to the idle setting for your truck, probably about 700 rpm. You can move back and forth between the screws to get the best steady idle. Just don't over do it on the idle mixture screw.
Good luck.

May 08, 2012 | Cars & Trucks

1 Answer

Cant find the idle screw


Hi allenplum,
There are 2 mixture screws, 1) the idle speed screw, 2) is the idle speed mixture screw. The idle speed screw is located on the carburetor, nar the throttle arm where your throttle cable is connected. There is a screw that you will find there that you screw in or out to speed up, or slow down the engine idle. The idle speed mixture screw is located lower down on carb and has a spring on it. There should be 2 screws side by side, one is the idle speed and the other is the high speed mixture screw. They are marked on the carb body, with the letter H or L . To adjust, remember the screw position before you do any adjustments. Start by turning the screw in (clockwise) all the way in until lightly seated, so no damage is done to the seat or needle. Turn out (counterclockwise) 11/4 inch, this should be OK to start the engine. Along with the idle speed screw, you should be able to get the correct idle required. With all the modernization happening, there might not be a high or low adjust as they are ported inside the carb. You might get just the high or just the low adjust needles. I hope this is helpful to you. All the best and good luck. Denis.

Mar 19, 2011 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

1 Answer

Wont idle


Not knowing if you know anything about idle speed settings, idle mixture, etc., first check to see if all carburetor components are fully in place and are in good shape. A vacuum leak will cause the symptom you are describing. After doing that, adjust the idle stop screw. If it just won't idle even after doing that, take out the idle mixture screw, blow out the screw hole with compressed air, and gently screw in this screw all the way in. (DO NOT FORCE it.) Then open it 2.5 turns. Adjust this screw for a good strong idle while adjusting the idle SPEED with the idle stop screw. Get assistance if you don't know how to do this stuff. Good luck.

Jan 04, 2010 | RTO 110cc Basic Manual ATV # ATD-125C

1 Answer

Need to know how many turns do i turn out the needle valves on the 11 hp briggs @ stratton. need to know for everyone. thanks


ADJUSTING THE IDLE SPEED AND MIXTURE
On some float-type carburetors, you can adjust the air-fuel mixture and engine speed at idle. Check for an idle speed screw designed to keep the throttle plate from closing completely, and an idle mixture screw that limits the flow of fuel at idle. If your carburetor contains these screws, proceed below.
  1. With the engine off, remove the air filter and air cartridge.
  2. Locate the idle mixture screw and turn it clockwise until the needle lightly touches the seat. Then, turn the screw counterclockwise 1-1/2 turns.
  3. If your carburetor has a main jet adjustment screw at the base of the float bowl, turn the screw clockwise until you feel it just touch the seat inside the emulsion tube. Then, turn the screw counterclockwise 1 to 1-1/2 turns. Replace the air cleaner assembly and start the engine for final carburetor adjustments.
  4. Run the engine for five minutes at half throttle to bring it to its operating temperature. Then, turn the idle mixture screw slowly clockwise until the engine begins to slow. Turn the screw in the opposite direction until the engine again begins to slow (image A). Finally, turn the screw back to the midpoint.
  5. Using a tachometer to gauge engine speed (image B), set the idle speed screw to bring the engine to 1750 RPM for aluminum-cylinder engine or 1200 RPM for engine with a cast-iron cylinder sleeve.
  6. With the engine running at idle (image D), hold the throttle lever against the idle speed screw to bring the engine speed to "true idle." Then, repeat the idle mixture screw adjustments from Step 4 to fine-tune the mixture (image C).

Sep 18, 2009 | Garden

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