Question about Yamaha YZ 125 Motorcycles

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2006 Yamaha YZ125, throttle randomly sticks. For no reason the throttle sticks we have checked the carb and it is fine, throttle has been cleaned. Do you have an suggestions as to what it might be?

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I would check to make sure that the cable is not frayed anywhere that could make it stick. Also make sure the cable is lubed up good and slides freely. make sure that your twist grip on the bars is working good also.

Posted on May 30, 2011

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04 yamaha yz125 when I start bike it revs flat out, checked carby &; looks ok


Hi, check the throttle slide is at the bottom with just a small gap, if its higher, check your throttle cable, if they are ok you might have some dirt in the jets, youneed to clean the the inside bottom of the carb and blow the jets out with an air line. good luck.

Nov 26, 2014 | 2004 Yamaha YZ 125

1 Answer

1998 air screw setting


Hi, Anonymous the carburetor throttle shaft wheel has two cables the cable closest to the right side of the bike is the throttle cable and the one closest to the left side is the idle cable. Right about the middle between the two is the idle adjustment bolt it faces out towards the air filter end of the carb . The engine should be at operating temperature with the enrichener off to set the idle between 950-1050 rpm. Turn the idle adjustment bolt clockwise to increases idle speed and counterclockwise to decrease idle speed. If you have access to your air fuel mixture bolt you may adjust it as well if not there is a video below on how to gain access, make sure you start with clean or new spark plugs. Gently turn the air fuel mixture bolt clockwise until it starts to bottom out "STOP" do not over tighten as it will damage the taper on the end, now back it out 2 full turns to establish a starting point start the engine and check the idle rpm's and adjust the idle adjustment bolt accordingly for 950-1050 rpm if necessary, adjust the air fuel mixture bolt 1/4 turn at a time and let the engine settle for about 10 seconds, clockwise for a leaner mixture and counterclockwise for a richer mixture you are seeking the highest rpm your air fuel mixture bolt can acquire without going past 3 full turns from bottom then readjusting the idle adjustment bolt back down to 950-1050 rpm If you can not detect any rpm change and can not stall the engine by turning the air-fuel mixture bolt all the way in then your pilot/low-speed jet is too big. Final adjustment should be made with a clean air filter mounted to the carburetor. 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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Jan 13, 2014 | Yamaha YZ 125 Motorcycles

1 Answer

1998 yz125 carb cleaning


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 21, 2013 | 2004 Yamaha YZ 125

1 Answer

I have a 2006 YZ125, that has pretty much been just garage kept since bought new in 2006. I've cleaned the carb and jets and cleaned the plug. The jets were gummed up but its still cutting out high rpms or...


Hi, Jamie it should be noted that your performance issues are not electrical ie. faulty charging system, battery condition, and connections etc. If your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" your not getting enough fuel.
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues. For more information about your issue and valuable "FREE" downloads that you will need please click on the websites below. Good luck and have nice a day.
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Jul 05, 2013 | Yamaha YZ 125 Motorcycles

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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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Mar 13, 2012 | Yamaha YZ 125 Motorcycles

1 Answer

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Hi, Billywill946 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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Jun 02, 2010 | 2003 Yamaha YZ 125

1 Answer

Throttle sticking


It's possible that your cable is frayed inside the sheathing somewhere - most likely up near the handlebars. The vacuum thing is not a problem on the 2-strokes like it is on a 4-stroke, so unless there is a burr or grit in the slide, I would suspect the cable is frayed.

Feb 21, 2010 | 2003 Yamaha YZ 125

1 Answer

I have a yz125 and the throttle won't turn. I


Two things will freeze a throttle >> a rusted cable and a stuck slide. The usual problem is a stuck slide. Disconnect the air cleaner and unbolt the carb. Pull it to one side and immerse it and the cable end in a small coffee can filled half full of denatured alcohol. Let it soak for 15 minutes. Now set the can aside. File down the end of an old toothbrush and put the new chisel end into the inlet side of the carb and under the bottom edge of the slide. Tap the end of the brush with a plastic hammer to pry the slide upward and break the slide free. The carb is going to need a through cleaning so remove the float bowl, air and throttle screws and slide assembly and let the parts soak in the alcohol along with the carb body. An hour soaking should be good. Now clean with spray carb cleaner, concentrating on the screw adjuster holes and drill circuits in the body of the carb. After reassembly, LIGHTLY seat the air and throttle screws then open up one half turns outward.

Drain the gas tank and clean it out. remove the petcock and clean it also. Install an inline fuel filter. Please rate my answer. Thanks!

Jan 06, 2010 | 2003 Yamaha YZ 125

1 Answer

87 yz125. gas pours straight through carb


change the needle and make sure its jetting right, check the floats if it is operational. '90 to '95 carbs are compatible, so if you are planning a replacement, you may use those

Jun 10, 2009 | 2003 Yamaha YZ 125

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