Question about 2004 Yamaha TT-R 125 LE

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Tt-r 125 e carburetor adjustment My son tried to clean the carburetor and set all the jets and screws tight. What do I set which jet at ?

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  • Yevgeniy May 11, 2010

    Jets are simply a piece of metal with a labeled size bore through it. It is not adjustable. consult a service manual for correct jet sizes, idle fuel screw setting and float height.



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The air screw and throttle screw are the only settings on the carb. Bear in mind they only screw in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. This is the factory setting. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine.

If the screw adjusters were screwed in tight they will likely need to be replaced. The end of the screws will have a depression ring and that little ring can screw up the carb.

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Posted on Sep 25, 2009


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How to adjust pilot jet on 2005 yamaha 125

There is no adjustment. It's a fixed jet and must be cleared with a cleaner or replaced if it doesn't clear. It's a very tiny jet. If you mean the idle mixture screw, just warm up the bike and adjust to the smoothest setting.

Dec 31, 2014 | 2005 Yamaha TT-R 125 L

1 Answer

Adjust carburetor yamaha 125 ttr

Hi, Anonymous if you have changed your fuel delivery system, air filter size or flow rate, mufflers or exhaust system your carburetors need re-tuning and 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.
Stock TTR125 Carb Screw Settings TTR
Ttr 125 Carb Idol settings
OEM parts for Yamaha

Jun 21, 2014 | 2006 Yamaha TTR 125 E

1 Answer

I have a 2005 Yamaha ttr 90 for my son. I cleaned the jets. Then itwould not idle so I adjusted the Idle on the handle bars. Now it hesitates when I twist the throttle. And before I adjusted the throttle...

Hi, Anonymous and the usual suspects are:
1. Idle speed improperly adjusted.
2. Air fuel mixture screws not properly adjusted.
3. Inlet system air leak.
4. Leaking accelerator pump.
5. Loose low-speed jet.
6. Plugged low-speed jet.
7. Contaminated or plugged low-speed circuit.
8. Enrichner valve/choke not seated or leaking.
9. Multi carburetors out of sync and need to be balanced.
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.
2002 ttr90 won idle
TTR90 Carb Fix
YAMAHA TTR90 Owner Service Manual
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Oct 29, 2013 | 2005 Yamaha TTR 90 E

1 Answer

How do I adjust the carburetor mixture screws on a 2001 yamaha ttr 125L

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 blue links below. Good luck and have wonderful a day.
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YAMAHA TT R125 Owner Service Manual
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Apr 30, 2012 | 2002 Yamaha TT-R 125 L

2 Answers

I have a Kawasaki TH43 strimmer, it starts but keeps loosing power or cutting out, fuel lines clean

If you have not used this for quite a time, gasoline could have gummed up the carburetor jets, plugs fouled or air filter clogged.
Clean the plugs using a wire brush or replace. Change or clean air filter. As for the carburetor you will need to disassemble that the clean with a carburetor making sure the small brass jets are thoroughly clean.

Mar 01, 2011 | Garden

1 Answer

I can't get the bike to idle at all. How do i fix this? i have tried messing with the idle screw, but it doesnt help.

first drain your float bowl. you may have water in the fuel. if this doesn't help then you must clean out the carb. you will need a can of spray carb cleaner. remove carb float bowl. use the right size screwdriver otherwise you will strip the screw heads. remove 2 jets and clean, clean the bores for the jets. use a strand of copper speaker wire to probe the holes in the jets. now you have to clean the idle mixture adjustment bore. first turn the screw closed counting the number of turns to gently seat the screw( write it down). then back out screw all the way- do not lose the spring or washer. spray carb cleaner in the hole . lastly spray the float valve backwards from normal flow. put it all back together. adjust idle mixture screw, start engine and allow to get hot then adjust idle speed screw. if you notice a flat spot back out the idle mixture screw a little bit until the hesitation goes away.

Jan 06, 2011 | 2005 Yamaha TT-R 125 E

2 Answers

Marauder 125.engine will only start on choke even when bike is warm. its doe 3000 miles and is 1998 model.

Sounds as if its starving for fuel. The corroborator could be dirty inside causing it to clog up and not show its best potential. Should be simple to take apart, remove, clean, and put back together

Jul 11, 2010 | 2000 Suzuki GZ 125 Marauder

1 Answer

2007 ttr 125 wont start unless hand is over the back of carb. also wont idle.At mid and high range it runs fine. There are no air leaks and no adjustment screw for the air/idle just a factory plug.

Time for carb cleaning, blow the jets with compressed air and check the fuel level in the float chamber, adjust if necessary.
Tht factory plug is where the air-mixture screw is and tht plug has been kept there for non tampering!
That screw is factory set.
Basically its the primary jet which is a problem in your bike's carb, but all in all might as well blow both of them.
Hope this helps!

Nov 13, 2009 | 2002 Yamaha TT-R 125 L

1 Answer

How do I re-jet my carbs?

Basic setting for idle adjustments is ~1-1/2 to 2 turns CCW from CW stop. New stock (paper) air filters don't require re-jetting--only K&N foam replacements require one size bigger main jet. Adjust each carburetor idle screw for smoothest idle. Each screw should be about the same adjustment--if one is non-responsive, that carburetor may need internal cleaning. Make sure you have good spark plugs and the ignition points are clean and set to proper clearance. The ignition coils on these old Honda's were typically weak--try to find a modern replacement. The carburetor slide needles should have the 'C' clips in the center groove. Make sure the retainers are down tight. Check the engine valve clearances (about 0.003 " cold) for both valves when the crankshaft is set for TDC when that cylinder is coming up on compression.

Aug 11, 2009 | 1974 Honda CB 200

1 Answer

2005 Yamaha TT-R 125 LE will not idle without choke on

Hi, Kirkbb1 and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the blue links below. Good luck and have a wonderful day.
TTR125 won idle except with the choke on
2004 TTR125 been sitting won idle
YAMAHA TT R125 Owner Service Manual
OEM parts for Yamaha

Apr 06, 2009 | 2005 Yamaha TT-R 125 LE

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