Question about 2001 Yamaha YZ 426 F

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What is stock setting for fuel air mixture screw?

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  • Yamaha Master
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Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Posted on Aug 02, 2016


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Posted on Jan 02, 2017

cape cod bob
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SOURCE: rich mixture virago xv250

look up your bike here and i think it is number 13 on the diagram. which looks like its right by where the throttle cable connects

Posted on Mar 24, 2009

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SOURCE: Fuel Air mixture screw

2 and a half make sure the bike's running when u do it the revs should sit between 1 and 3/ 2 2half

Posted on Jun 05, 2009

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SOURCE: where is the air/fuel mixture screw

A “very helpful” rating for this answer? Thanks!


Posted on Jun 28, 2009

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SOURCE: Yamaha SR185 1981 carb settings

Righhttt And I need some new brain cells, stock jet size is .075 float level in 17/64ths turn adjustnebt screws in till they bottom out lightly then turn one and a half turns out andthat should get it to run, otherwise go to the nearest library and check out the book for that modle. there is another adjustment for the venturi plates but don't remember the exact proceedure.

Posted on Nov 22, 2009

  • 194 Answers

SOURCE: How many turns of the

The air screw on any motorcycle is adjusted to obtain the highest, smooth idle then turn in about 1/4 turn. This is the ideal setting for this screw. Simply put - this screw alters your pilot jetting and has very little effect on anything other than idle to about 1200-1500 RPM.

Posted on Jun 01, 2011

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How many turns in air screw?

turn the mixture screw all the way in then back it out between 1 1/2 turns to 2 turns
that will get the engine to idle from there set the idle speed with the throttle screw to desired idle rpms
now turn the mixture screw in slowly until you see/hear a fall in rpms
now screw the screw out until again you hear /see a fall in rpms.
half of the number of turns back in from in to out will be the desired air /fuel mixture setting
adjust the idle with the throttle screw if it has altered
you can repeat the procedure again to fine tune the mixture after adjusting the throttle screw

Sep 14, 2015 | 2006 Hero Honda Splendor+

2 Answers

I have a Honda cl 175 from 1976 what are the carb settings ?

Hi there. The ''default'' settings are :
step #1 turn the mixture and idle screw all the way in clockwise
step #2 you turn counter clockwise the mixture screw for 1,5 rounds, and the idle screw when the motor can run freely without going off.
#3 Then you adjust the mixture screw if you do not like the outcome by micro movements clockwise. Hope i helped.

Apr 02, 2015 | Honda Motorcycles

1 Answer

My husband touched the carb settings on my sons new 2007 ttr 50. I read the manual to try and find the number of turns to return to stock settings. Can you please please help!

The carb mixture screw may add air or fuel, depending on the model. If the bike will idle it can be adjusted without knowing the factory setting. What you want is the highest idle that can be achieved using just the mixture screw, not the idle setting screw. Start the motor, then slowly turn the mixture screw in. If the idle speed increases, continue in that direction. If it slows and becomes rough, turn the screw back out until you reach the highest idle speed. That will the correct setting for the bike at your altitude.

Sep 23, 2014 | Motorcycles

1 Answer

My 1998 Honda Shadow ACE 750 backfires alot when i let off the throttle. What causes this?

Sounds like your fuel air mixture is a little rich. Check your plugs, if they are black you are running rich which will cause some of the excess fuel to be burned off in your exhaust. Two common problems with a bikes fuel air mixture is bad plugs, if one does not fire consistently all the time it will leave excess fuel in the combustion chamber. Another would be a clogged air filter keeping the fuel air mixture unbalanced as well.

Lastly if you are able to, you may adjust your air fuel screws on your carb. However most Honda's are stock with Keihin carburetors and these air fuel screws are plugged so you cannot make adjustments without drilling out the plugs.

May 16, 2012 | Honda VT 750 C2 Shadow Motorcycles

1 Answer


Yamaha actually doesn't give specs for fuel air mixture. The manuals state that each bike is individually tuned at the factory, and if you clean the carb, you're supposed to screw it in, record the number of turns and put it back to that setting.I have one, and currently it's at 2 turns out, and for all little bikes, between 1 and 3 is where they should be at. If it won't idle, the pilot jet is wrong or dirty. Good luck!

Jun 11, 2011 | Yamaha Aries 50 Motorcycles

2 Answers

I just put on a new rebuilt carburator on my 460 v8 1987 xlt 250 ford truck 4 WH. drive. its a motorcraft stock holley. I cant seem to find a way to ajust it. Wont run smooth or idle? It was set up for...

You have two setting screws on front of carb, You start off by adjusting all the way to the left, Then back off 3/4 turn to both setting screws, Then you have to set your air fuel mixture by just slowly turn your setting clock wise do so until vibration go away. Sorry there is no easy way to explain, Good luck to you,

Apr 03, 2011 | Ford F-250 Cars & Trucks

1 Answer


the carburetor settings are easy : 1- locate the screw mixture air /fuel 2- wind the screw all the way in 3- unwind the screw 1 1/2 turn and this should be sufficient to set the carburetor back to its original settings for the air/fuel mixture . 4- as for the idling screw , wind it down to suit the revs required

Dec 31, 2010 | 2002 Yamaha TT-R 125

1 Answer

What is the correct air fuel mixture for my 79 yamaha xs650

Turn the throttle screw and the air screw all the way in until they LIGHTLY seat. Now open each of them one and one half turns. This is the stock factory setting.

Oct 29, 2009 | 1979 Yamaha XS 650 SF

1 Answer

Just wanna no the air/fuel mixture setting how many turns out is recomended what is factory setting and also best plug gap spec cheers

LIGHTLY seat both the throttle screw and air screw. Now back each one outward one and one half turns. This is the stock setting.

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Sep 30, 2009 | 2000 Honda XR 650 R

1 Answer

I have a 2003 Yz 250F. 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?

Jun 09, 2009 | 2004 Yamaha YZ 250 F

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