Question about 2004 Yamaha TW 125

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Yamaha 125 TW looses power and throttle at top speed or revs

The bike will suddenly loose power and **** or shudder or even just grind to a halt at about 50mph. At times it regains power but sometimes the throttle is useless until the bike has been switched off and restarted.

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  • elliotneace May 11, 2010

    I RAN INTO A SIMULAR PROBLEM ONCE ON A HONDA TRANLAP 125.



    FIRST QUESTION IS DOES THE BIKE SEAM TO GET REALLY HOT MORE THAN WHAT IT HAD BEEN?



    AND HOW OLD IS IT?



    AND HOW LONG HAS IT BEEN SITTING FOR ?



    HAVE A GOOD DAY



    ELLIOT NEACE

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5 Suggested Answers

  • 3567 Answers

SOURCE: odometer not woking on yamaha tw125

Google " motorcycle salvage yamaha ". You should be able to find a good used one there.

Please rate this answer. Thanks mltwalsh!

Posted on Apr 21, 2009

  • 3567 Answers

SOURCE: yamaha tw 125 2

ALWAYS have a fire extinguisher at hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and 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 idle screw and the air screw 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 adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster 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. If the problem is still there, the float height needs to be reset. If possible take the carb to a dealer and let them put a float gage to it. Probably cost $15 but call and ask before you take the carb in.

Please rate this solution. Thanks!

Posted on May 06, 2009

  • 11 Answers

SOURCE: yamaha tw 125

The noise you hear is valve clatter. You should not adjust your timing chain. Instead get a manual and find the vlave clearances for that bike. (Ex. The exaughst valve may be .006" and the intake valve may be .004") Then you'll need a feeler gauge, and to do this you'll remove the valve covers and get the engine to TDC (Top Dead Center) This is where the piston is at the very top of it's stroke and both valves are shut. (compression stroke) You must then loosen the rocker arm nut to the point that you can insert the feeler gauge between the rocker arm and the top of the valve run the nut down tight to the feeler gauge and then pull gauge out and repeat on the other valve.

Posted on Aug 24, 2009

  • 269 Answers

SOURCE: 03 yamaha tw 125cc, bike wont go

Could be a number of things....but sounds like it might be fuel starvation. Check your fuel filter and maybe replace it. Check and make sure there is fuel flowing to the carb. After that you would have to service the carb.

Posted on Oct 23, 2009

  • 245 Answers

SOURCE: what are the valve clearances on a yamaha 125 TW

They are listed in the service manual.
You can download a free one at
http://www.yamaha-motor-europe.com/community/service/manuals.jsp
Good luck!

Posted on Nov 21, 2009

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1 Answer

Cuts out at higher revs


Hi, Anonymous the following applies to carbureted also fuel injected models and the usual suspects are:

1. Severely discharged or a damaged battery, 9 volts or lower.

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.

7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.

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. Water or dirt in the fuel system, carburetor or filter.

11. Restricted, blocked or kinked fuel line.

12. Fuel tank empty.

13. Gas cap is not venting properly or fuel tank venting system blocked.

14. A failed fuel pump, pressure regulator and or fuel injectors.

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 visit the websites below. Good luck and have a nice day.

https://yamahaclub.com/forums/topic/21307-dt-125-r-cutting-out-problem

Dirt Rider Magazine

http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf

OEM parts for Yamaha

http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

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1 Answer

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wot should it rev to at max revs ? is 4th gear top gear , if so are the sprockets original size as a smaller rear spocket will make it go faster but you can loose top revs in top gear and if carbs etc havent been adjusted to cope with this !

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Hi, Anonymous and the usual suspects are:
1. Idle speed improperly adjusted.
2. Inlet system air leak.
3. Leaking accelerator pump.
4. Loose low-speed jet.
5. Plugged low-speed jet.
6. Contaminated or plugged low-speed circuit.
7. Enrichner valve is not seated or leaking.
For more information about your issue please visit the websites below. Good luck and have nice a day.
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http://www.lewisportusa.com/manuals.htm
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1 Answer

No power on low revs, cuts outs doing a u turn and ticks over but will cut out. fine in high revs.


Hi, Anonymous the following applies to carbureted also fuel injected models and the usual suspects are:
1. Severely discharged or a damaged battery, 9 volts or lower.
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.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture ***** improperly adjusted.
10. Water or dirt in the fuel system, carburetor or filter.
11. Restricted, blocked or kinked fuel line.
12. Fuel tank empty.
13. Gas cap is not venting properly or fuel tank venting system blocked.
14. A failed fuel pump, pressure regulator and or fuel injectors.
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 visit the websites below. Good luck and have a nice day.
https://yamahaclub.com/forums/topic/21307-dt-125-r-cutting-out-problem
YAMAHA DT 125 problem
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

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1 Answer

Yamaha dt 125 looses power at high acceleration


Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. If necessary, transport your bike to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your problem. Good luck and have a nice day.
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http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

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1 Answer

My bike runs but after it warms up it looses power


Have the shop do a compression check. Chances are the valve faces are carboned up and/or burned. it is likely the valves just need to be re-seated using valve grinding compound. Th cylinder head gets removed for access to the valves.

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1 Answer

03 yamaha tw 125cc, bike wont go


Could be a number of things....but sounds like it might be fuel starvation. Check your fuel filter and maybe replace it. Check and make sure there is fuel flowing to the carb. After that you would have to service the carb.

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Hi
I have been working on my carb today,the pipe from the bottom of the carb should just run down by the bottom of the swinging arm,there should be another pipe from the pipe on the left side of the carb just above the fuel intake which also runs down to the swinging arm and connect to nothing.
Cheers

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