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Ttr 125 2003 Yamaha misfiring

My bike is misfiring. Changed spark plug about three times because it comes out black after every ride. Ive emptied old gas. Checked oil. I am thinking its carb, but not sure. Rides fine at first then runs rough. One minute I'm going really fast and the next minute it's just putting around

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Posted on Jan 02, 2017

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SOURCE: 1995 Suzuki DR650 still running rough

sounds to me like your jets are running rough, wich makes you loose power and make the bike run like sh*t, so simple re-jet it (65-75 dollars) and it will be running like a charm again

Posted on Jan 15, 2009

  • 357 Answers

SOURCE: Yamaha 2002 TTr 250

Hi hoeygatt

Look around your bike near where the throttle cable meets the engine, when you pull the throttle, the cable pulls a quarter circle piece of metal which is connected to a spring, then connected to that should be a screw, that is the idle screw, turn it very slightly, usually clockwise to make the idle higher, and this should sort out the problem.

Please remember to rate this solution as FixYa!

Kind regards

Posted on Apr 12, 2009

  • 1 Answer

SOURCE: cold starting problems 1981 yamaha maxim 400

I had the same problem. I found that the ground on the wire harness under the seat was not grounded! It is worth a check.

Posted on Jul 15, 2009

  • 1 Answer

SOURCE: Yamaha TTR 125 L won't idle

The problem is that your idle is adjusted to low just like mine, you need to adjust your idle

Posted on Aug 04, 2009

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SOURCE: 1995 Suzuki DR650 running rough

Ignition timing is preset and only very badly worn camchain or valve-train issue would have an effect.

You may have a problem with the floatbowl height.
It is an incremental fix, in that you set it and see how it responds.

The fuel availability is governed by the height of the float levels. This can be adjusted by bending the small brass tab on the float spindle. Try adding more fuel first, or bend tab upwards very slightly. you don't have to remove the carby every time, just loosen the front and back manifold clamps and rotate carby so you can acces float chamber screws. The float pin can be pulled out and tab reset. Don't forget to turn fuel off and have a spill tray ready when undoing floatbowl drainplug each time.
Site below has exploded view of the carby with part names, links to all sections of the bike.
Clean all the jets with a carburetor solvent and check fuel line for perishing. Are inlet manifolds in good condition and not have a chalky feel on the insides, they should be shiny and feel slippery for efficient results.

Goodluck, cheers!

Posted on Oct 18, 2010

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1 Answer

What is the spark plug gap for a 2007 yamaha ttr 125?

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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Yamaha ttr90 no spark

Hi, Anonymous and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and CDI box.
5. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose, check for spark leakage in the dark.
6. Faulty ignition coil, pick up coil, trigger coil or CDI box testing needs to be checked with an ohmmeter at 70 degrees Fahrenheit
7. Faulty safety switches clutch, kickstand, neutral, off/on etc.
8. Faulty ignition switch.
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I have a 2008 Yamaha ttr 230 The bike ran fine last fall. I ran it this spring and now it stalls as soon as I give it some throttle. It seems to idle fine

slight buildup in the jets will do this. I recommend 9$ seafoam 1/3 can to 1 tank of gas for three times in a row .this works 90% of the time before spending $$$ at a shop.also put a new spark plug even though it starts the old one could be fowling out.

Jan 26, 2013 | Motorcycles

1 Answer

Why does my 125 ttr keep on fouling plugs

Hi, Anonymous and the usual suspects are:
1. Fuel mixture too rich or enrichner left out too long.
2. Faulty spark plug.
3. Incorrect spark plug for the engine type or service.
4. Piston rings badly worn or broken.
5. Valve guides are badly worn and/or seals worn, crushed or have come off the valve guide and are pumping oil through it.
6. Spark plug cable weak or leaking check for spark jump in the dark.
7. Faulty ignition coil.
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Feb 09, 2012 | 2006 Yamaha TTR125LW

2 Answers

Older model yamaha ttr 125. has not ran in years. spark plug is fine and put new gas in it. Oil is also fine. Possibly the carb but is there an easy to fix method instead of taking bike to dealership?

If the compression is good and you have a spark at the plug, remove the carburetor and give it a thorough cleaning. Take care not to attempt to clean jets with anything made of steel or you will wind up damaging them and buying new ones. If you don't feel comfortable disassembling the carburetor, remove it and take it to the shop for a rebuild instead of hauling the whole bike; but first ensure that you have compression and spark.

Jun 24, 2011 | 2002 Yamaha TT-R 125

1 Answer

My 2004 ttr 225 yamaha has almost no spark, i want to test the coil, pick up coil, CDI, n CDI starter but dont know what levels Im looking for. Also want to know the ignition diagnosis specs. Im...

it has to be 12v. the bike runs on a 12v system. before u check the cdi. check the plug. and the gaping. i had the same problem but it was the pulse coil. the ttr 225 is more of a beginer bike it comes from the factory very lean. so it might not be that you have a low spark because they are not ment to be fast they just have a low spark from the factory. check your carb and the jets. that might just be your problem. let me know how it works out.

Sep 21, 2010 | 2004 Yamaha TT-R 225

1 Answer

TTR 50cc Yamaha Little bit of oil comes out muffler

try a new spark plug first, take the spark plug out, put hd lead cap back on and touch it to metal and crank the bike oversee if your getting a spark at all. if not change the spark plug

May 08, 2010 | 2005 Yamaha TT-R 125 E

2 Answers

2001 yamaha ttr 250, starts, idles ok, bogs at acceleration

Has the bike been stored for any long length of time?
old fuel in the carburetor will turn to a varnish like residue blocking the jets,or possibly water in the carburetor.

May 03, 2010 | 2002 Yamaha TT-R 250

1 Answer

Yamaha TTR 230 When i pulled in the dealer they

take the plug out and see if theres a spark buddy get back to me

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

2 Answers

No Spark on TTR 125 L

Ignition Coil Problem or the CDI. Check for both. Replace the spark plug with a new one for diagnostic purposes.. check also for the wire. I recommend using split fire wires as they're heavy duty. Check that the wires are making contact with the spark plug up to the starter relay to the battery.

Mar 14, 2009 | 2002 Yamaha TT-R 125 L

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