Question about 2005 Yamaha XT 125 R

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I have a yamaha xt 125 r and every time i am flat out it dies

I have a yamaha xt 125 r and every time i am flat out the revs die the throttle goes and it just stals can anyone help me please iv checked the carb(cleaned it out checked the needle and float)iv checked all wires taped them up just in case and took top of the air fillter and put fine mesh on top bike runs much faster cause more air but it still does it(the mesh is very fine no bits can get through).

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  • Yamaha Master
  • 45,570 Answers

Hi, Broozer123 and the usual suspects are:
1. Inlet system air leak.
2. Enrichener valve not seated or leaking.
3. Damaged or restricted fuel tank vent system.
4. Restricted fuel supply tract.
5. Dirty or damaged air cleaner element.
6. Plugged bowl vent or overflow.
7. Worn or damaged needle or needle jet.
8. Vacuum piston assembly malfunction.
9. Loose or plugged main jets or passages.
10. Improper float level.
11. Accelerator pumps inoperative.
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.
derestricting XT125
Carburator Theory and Tuning
Yamaha XT 125R 2005 Service Information
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xt-owners-manuals

Posted on Jun 05, 2017

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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  • 104 Answers

SOURCE: XT 125 oil problem

the iol fill is the black bung on the engine right hand side anticlockwise to unscrew with fingers its right next to starter motor

Posted on Jan 20, 2009

MakisRC51
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SOURCE: yamaha dt 200 won't rev off idle

You should measure the combustion ratio.Maybe piston rings failed.

Posted on Jun 03, 2009

joughton
  • 40 Answers

SOURCE: I have a Yamaha XT 550 and it was running strong

If it died over a bump, the problem is almost certainly electrical. Check that all the fuses are firmly in place in the fusebox (while you're in there, clean off any corrosion you notice). Have a careful look at the cable that grounds the battery to the frame-- take the bolt off, clean off corrosion (steel wool or fine sandpaper). Try shorting out the contacts from the ignition lock -- maybe one of those wries snapped or came adrift. If it starts or the lights come on, there's your problem. Does this model have a killswitch that could have been bunmped to the "off" position?

Posted on Jun 04, 2009

robotek
  • 1512 Answers

SOURCE: yamaha ybr 125 top speed

Hi les
Not much to start with here unfortunatly mate. A free flow muffler will help top end speed, change the factory airbox to a K&N style pod air filter, other than that, hugging the tank at top speed :) If you do change these parts, you may also need to increase the main jet size to richen up the mixture for better tuning of the motor with the better flowing parts. This bike has a top speed of 100kmp and produces 10 hp, so you may only expect to get at best less than 1 extra neddy, and perhaps another 5 km/hr.... I suggest upgrading to a bigger machine of you feel the need for speed :)
If its 125's you are into, test drive a Honda CBR 125R 6 speed fuel injected 13.4 horsepower, and good for 120km/hr
regards robotek

Posted on Jul 10, 2009

  • 440 Answers

SOURCE: Yamaha 535 stalling out and losing power after running for a bit

Sounds like a fueling problem either water in the carbs or the fuel flow from the tap is insufficient. If there is a vacuum pipe it may have been dislodged or holed.
Ride Safe
Bike-Doc

Please mark this as useful (if it has been!!)

Posted on Aug 03, 2009

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1 Answer

My xt 250 1981 model wont run proprely


Hi, Champion and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
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8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture screw improperly adjusted.
10. Accelerator pump damaged or not working.
11. Water or dirt in the fuel system, carburetor or filter.
12. Restricted, blocked or kinked fuel line.
13. Fuel tank empty.
14. The gas cap is not venting properly or fuel tank venting system blocked.
15. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
16. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you need please click on the links below. Good luck and have a nice day.
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XT 125 R carburetor diagram


Hi, Anonymous 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. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on blue links below. Good luck and have a wonderful day.
XT 125 carburetor diagram Google Search
Yamaha XT125 Carb Tips Mikuni 3D6
http://gigi600.altervista.org/immagini/xt125r/XT%20125%202005_service.pdf
OEM parts for Yamaha
http://www.yamaha-motor.com/assets/service/manuals/2010/lit-11626-23-37_xt250_2010_1680.pdf

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,,. this should fix your scooter...!!

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