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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  • 52,027 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

Btw, I’m available to help over the phone in case u need at

Posted on Jun 05, 2017


6 Suggested Answers

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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

  • 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

  • 408 Answers

SOURCE: yamaha dt 200 won't rev off idle

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

Posted on Jun 03, 2009

  • 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

  • 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

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

Posted on Aug 03, 2009

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