Question about Yamaha TT-R 125 L Motorcycles

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Yamah TT-R 125L has sat for awhile so i cleaned the carb out from top to bottom now it runs and idles well but when i get the throttle cracked past half way it bogs out what can i do? and the weird part is it revs to the moon in neutral?

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  • mikeb103 Oct 13, 2010

    Did you clean the NEEDLE JET? (the 1" long jet from the venturi to the bowl) this usually gets overlooked because its so hard to remove but it is what controls the bike from 1/4-3/4 throttle. This is not the main or the pilot jet.

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  • Yamaha Master
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Jets need ajusting but seem ok without a load

Posted on Oct 13, 2010

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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.
Stock TTR125 Carb Screw Settings
Ttr 125 Carb Idol settings
YAMAHA TT R125 Owner Service Manual
OEM parts for Yamaha
YAMAHA TT R110E Owner Manual

Apr 30, 2012 | 2002 Yamaha TT-R 125 L

1 Answer

Hi, it appears that the floats are sticking on my 2002 TTR 125L. I have taken the carb off and cleaned it really good numerous times, and I just purchased a new carb rebuilt kit, and replaced it, to no...


Hi, Anonymous and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
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.
TTR 125 Float level
TTR 125L Gas leaking when IDLE
YAMAHA TT R125 Owner Service Manual
OEM parts for Yamaha
YAMAHA TT R110E Owner Manual

Dec 27, 2010 | 2002 Yamaha TT-R 125 L

1 Answer

Spits and sputters past half throttle


sounds like your carb needs cleaned, very simple to do. pull the carb off the bike and take the bottom off. then spray carb cleaner in every little hole you see and everywhere else too. then some compressed air and put it back together. should fix er up! rate my answer

Jul 27, 2010 | 2005 Yamaha TT-R 125 L

2 Answers

My yamaha ttr 125l wont start it keeps turning over and then dying like it has no gas but it has lots any ideas?


too much fuel will cause same symptoms, grab a can of car throttlebody cleaner from the parts store, and pinch the fuel line off, and attempt to start till fuel is empty in the bowl of the carb, then spray cleaner in carb with the throttle full open 2 to 3 times close throttle, start, as it attempts to run spray slowley while engine runs, adjusting the flow as you rev engine.this eleminates poss bad gas or carb problems. if it runs fine this way then check gas, and check the carb. (while cleaning use a small wire to clean the tubes inside the carb as well, good luck!

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

1 Answer

Bike sat and now wont run right


first of all i would change the spark plug, then change fuel and makle sure ,carb is letting in fuel make sure , float is not stuck

Sep 07, 2009 | 2001 kawasaki VN 800 Vulcan Classic

2 Answers

Bike sat for awhile, runs but doesnt idle very good. cuts out


I would remove and clean the sparkplugs - sounds like one may be fouled.

Aug 18, 2009 | 1994 Yamaha FZR 600

2 Answers

Idles high


any service lights coming on ? If so , have the system scanned for failure codes, to determine idle problem. Hope this helps

Apr 08, 2009 | 2005 Chevrolet Cavalier

1 Answer

05 ttr 125L quick throtle on causes engine to stop


Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ). Remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. 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. Set the idle speed with the idle screw. This process should get you back on the road.


Please rate this solution. Thanks!

Apr 01, 2009 | 2005 Yamaha TT-R 125 L

1 Answer

My 2005 TT-R 125 has sat for a while.....


Your carb is gummed up if you let it sit for a while. It is not getting any gas through it is why once the starter fluid runs out it quits. Take the carb of and clean thoroughly. I do me take apart and clean clean clean.

Mar 08, 2009 | 2005 Yamaha TT-R 125 L

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