Question about 2003 Yamaha YZ 125

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Need info on fual mixture for a yamaha yz 125 1998

What type of gas mixture

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90% of these bikes run 32:1 - 40:1 mixture

Posted on Dec 30, 2008

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It is usually a 2:1 mix but u can call a bike shop and they should know the mix

Posted on Dec 20, 2008

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Air/fuel mixture


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 $10 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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Apr 12, 2014 | 2004 Yamaha YZ 450 F

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What is stock setting for fuel air mixture screw?


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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Where is the fuel mixture screw on a yz426f 2002 carb


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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Aug 11, 2012 | 2001 Yamaha YZ 426 F

1 Answer

YZ 450 Stalls when you hit the gas


Hi, Anonymous and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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Apr 09, 2012 | 2004 Yamaha YZ 450 F

1 Answer

Problems with stalling at low speeds and not idling well


Hi, Jonathan and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals
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Jan 02, 2012 | 2005 Yamaha yZ 250 F

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Excessive stalling at low speeds on 2005 yamaha yz250 f


Hi, Jonathan and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
Dirt Rider Magazine
YZ250F terrible low end bog stutter Intake Jetting Fuel Injection
2001 2013 Yamaha YZ 250 Service Manual YZ250 Moto Data Project
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Jan 02, 2012 | 2005 Yamaha yZ 250 F

1 Answer

Changed reed valves drained out old gas put in new gas now it won't start. It's a 2004 Yamaha Blaster


hi mate on the carb there are 2 screw one for mixture and one for idle you need to unscrew the mixture screw 1/2 of turns and see if this improves 1728936.jpg

Aug 29, 2009 | 2004 Yamaha YZ 125

1 Answer

My 06 yz 450 just started to smoke , it is in great cond otherwise,


If it has allot of use & hours on the motor - then its typical.. The piston & rings ware out on 2 stroke engines.. They need to be replaced after so long.. It common..

Or maybe a little to much iol in the gas mixture..

Hope this helps !!
Rate me good ;o)

Jul 13, 2009 | 2004 Yamaha YZ 450 F

1 Answer

My 2003 yz 125 hesitates when you give it gas.It does it every time you switch gears.You have to give alot of gas to straighten it out.


it is one of a few things causing it to flail in the lower end, 1: your fuel oil mixture isnt lean enough.. 2: you need a higher spaking plug.. 3: your carburetor float level is out or 4: there is a slight break in the ignition spak line which would cause it to spark very weak until maximum accelleration is reached

Jun 03, 2009 | 2003 Yamaha YZ 125

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