20 Most Recent 2001 Yamaha TW 125 Questions & Answers


Hi, Brian and the usual suspects are:
1. Idle speed improperly adjusted.
2. Air fuel mixture screws not properly adjusted.
3. Inlet system air leak.
4. Leaking accelerator pump.
5. Loose low-speed jet.
6. Plugged low-speed jet.
7. Contaminated or plugged low-speed circuit.
8. Enrichner valve/choke not seated or leaking.
9. Multi carburetors out of sync and need to be balanced.
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.
2005 carb issues slow to idle down
http://yamahaforum.com/forums/utility-atv/2475-1997-yamaha-timberwolf-idle-backfiring.html
Yamaha TW125 1999 Service Manual
OEM parts for Yamaha
YAMAHA TW125 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

2001 Yamaha TW... | Answered on Feb 05, 2017


Hi, Anonymous and the usual suspects are:
1. Idle speed improperly adjusted.
2. Air fuel mixture screws not properly adjusted.
3. Inlet system air leak.
4. Leaking accelerator pump.
5. Loose low-speed jet.
6. Plugged low-speed jet.
7. Contaminated or plugged low-speed circuit.
8. Enrichner valve/choke not seated or leaking.
9. Multi carburetors out of sync and need to be balanced.
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.
Yamaha TW200 Trailway Discussion Forum
TW200 Running Idling issue help
Yamaha TW125 1999 Service Manual
OEM parts for Yamaha
YAMAHA TW125 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


2001 Yamaha TW... | Answered on Jan 30, 2017


Remove clutch cover and check to see if clutch is actually disengaging. Either it is not hooked up properly or it is broken.

2001 Yamaha TW... | Answered on Apr 11, 2013


Without power to the clutch and trans alot of bikes will not disengage. Only when running

2001 Yamaha TW... | Answered on Apr 11, 2013


It is very common for a manufacture to us the same engine in many models. take a look at a Yamaha TTR 125 on line or on a parts breakdown. I would bet it has the same motor as your BW.

2001 Yamaha TW... | Answered on Jan 07, 2013


carb needs cleanin or overhaul--choke is dirty and jets also--howevr they mite just need ajustn-but let a pro doit cause engine damage cud occur

2001 Yamaha TW... | Answered on Dec 04, 2012


Its compression issue.Get the compression checked, when bike is not starting, when its warm.Also get compression checked, when its cold.Due to hot/warm the hoses filters gets expanded and pressure gets released.When its cold, the components are contracted and pressure gets held up and it starts normally. sounds to me that it could be that the engine is getting warm and as metal does when it gets warm it expands could be losing compression to the cylinders and is un able to run due to lost compression.There is too much compression and it is not allowing the engine to start.-------- Also other possibility can be stator issue.When the engine is warm, its not letting the voltage to battery to get the engine started.The starter can also do the same, if its get hot, it will not click and not let the solenoid to engage.Tap on starter with rubber hammer or mallet few times, then see if it starts.The starter bushings are wearing out, the rotor in the motor is going out of alignment and binding. Tapping it probably will knock it loose. ------- This troubleshooting possibilities will help, to locate the fault.This should help.Thanks.Helpmech.

2001 Yamaha TW... | Answered on May 06, 2011


Hi, you should slightly bend the float tang, so it will push the needle "later". stoth659.jpg

2001 Yamaha TW... | Answered on Nov 08, 2010


hummm check your electrical connections make sure you have the stop run switch is in run position,you have fuel flow to the carb, make sure you are getting spark to the spark plug by using a extra spark plug remove the plug cap and ground it to the head and kick start the engine and see if you are getting spark to the plug.
hope this helps

2001 Yamaha TW... | Answered on May 06, 2010


60 lbs. is very very very low. was your cylinder scored at all. you may have siezed rings. on a two stroke, a leakage test (pressure test) will tell you if its leaking through the rings by air escaping through crankcase breather(listen through airbox) or head gasket which you would probably have already noticed. but honestly if you only have 60lbs, your problem will be very noticeable.

2001 Yamaha TW... | Answered on Apr 09, 2010


You have to adjust the jets on the carb, theres a high and low jet, Turn them both all the way in ( dont force them) just turn until they stop, now losen each one in 1/4 intervals and try running it,

2001 Yamaha TW... | Answered on Apr 04, 2010


remove the seat- 2 screws from the bottom

2001 Yamaha TW... | Answered on Mar 31, 2010


check with e-bay.com

2001 Yamaha TW... | Answered on Mar 15, 2010


Wherever you took that ATV, do not bring it there anymore! I do not know the extent of your problem but the tech is off his nut. IF it was a carburetor operation problem and rebuilding the carb was performed, letting it sit for two months is not going to affect the carburetor's operation.

If it sits for so long the fuel in the tank turns to varnish and clogs up fuel lines and can plug the carburetor's jets and needles, all you would need to do is spray carburetor cleaner to get rid of the varnish. If the tank's fuel is bad because it sat so long you may have to remove the tank, flush it and replace the fuel lines, then fill with fresh fuel.

If you can give me more information, I can help you further.

2001 Yamaha TW... | Answered on Jan 14, 2010


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

2001 Yamaha TW... | Answered on Nov 29, 2009


http://www.tw-parts.com/macbig2k1/doc/tw125-2002.pdf
Heres an online manual for you with all the specs you require

2001 Yamaha TW... | Answered on Nov 05, 2009


look on e-bay

2001 Yamaha TW... | Answered on Jul 22, 2009


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!

2001 Yamaha TW... | Answered on May 06, 2009


Sounds like a battery that will not hold a charge, not enough left in the morning for a good spark. Once running for a short bit the battery gets recharged so the bike starts all day. Then the battery dissipates the charge overnight. Try a morning jump start from your car battery.

Before you spend $50 or so on a battery, look to see if there is water covering the top of the battery plates. If so then the current battery needs to be replaced. If not, add water to cover the top of the plates and ride it for a day. See if it holds a charge now. Battery may still be bad but it was worth a shot.

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. This process should get you back on the road.

Please rate this solution. Thanks!


Please rate this answer.

2001 Yamaha TW... | Answered on Apr 27, 2009

Not finding what you are looking for?
2001 Yamaha TW 125 Logo

24 questions posted

Ask a Question

Usually answered in minutes!

Popular Products

Top Yamaha Experts

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1176 Answers

Paul Ellermets

Level 1 Expert

6 Answers

Neil Lancaster
Neil Lancaster

Level 1 Expert

14 Answers

Are you a Yamaha Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

TW 125 Yamaha

  • TW 125 Yamaha

Most Popular Question

get battery yamaha tw125 in

  • Motorcycles
Loading...