Question about 2000 Yamaha TW 125

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My tw 125 wont throttle it ony idles any ideas

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Hi,
It could be caused by lots of things. I would suggest to clean the carburetor- as first the float chamber, if there was fuel through winter. Check if the pilot jet is set correctly. If these things not helped, clean the airfilter.

Posted on Apr 05, 2011

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1 Answer

Yamaha tw 125, not idling properly


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
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YAMAHA TW125 Owner Manual

Feb 27, 2013 | 2001 Yamaha TW 125

1 Answer

2005 Honda CBR 125 R high idle


Hi, Daniel and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector.
10. Multiple carburetors not in sync.
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.
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http://www.partsfish.com/page/oem-parts-for-honda
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Jun 06, 2012 | 2005 Honda CBR 125 R

1 Answer

Do you have any ideas how to adjust supply of 2t oil that cause too much smoke and oil coming out from exhaust pipe?a newly overhaul kmx 125, 2002 model .


You adjust the oil via the oil pump. The throttle cable splits, one section goes to the carb and the other to the pump, you adjust the play/tension of the wire on the pump, while pulling back the throttle to see if it's aligning properly at full throttle and idle. Two strokes tend to be very smokey so unless the smokes an unusual colour it's usually not a problem. I have a Kmx 125 with a 200cc engine, I prefer running slighty rich on oil, better than running slightly lean! :)

Aug 12, 2011 | 2002 kawasaki KMX 125

1 Answer

I have a keeway speed 125 and the engine sut out on me the other day , it will start and sit at idle but wont rev , it just cuts the engine . any ideas?


try the needle on the end of throttle where i goes into carb, mine was wor and very loose moved needle to a higher notch and away it went. but really needs new needle

Jun 03, 2011 | 2010 Keeway Speed 125

1 Answer

2003 Yamaha TW 125 A/F mixture adjustment


Hi, Revasns2001 it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal.
https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
7. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
8. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
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.
Life On 2 Wheels
CV carburetor tuning part 2 Mixture screw adjustment
Yamaha TW125 1999 Service Manual
OEM parts for Yamaha
YAMAHA TW125 Owner Manual

Aug 23, 2010 | 2003 Yamaha TW 125

1 Answer

Honda 125 nsr 1990 wont idle and engine races


sounds like your throttle cable might be frayed or broken, when you pull the throttle and let go does it go back on its own? and can you here a clicking sound when you close the throttle? If you could send me pictures of the carb how every thing goes in and take it apart and take pictures, that would be helpful.

Jun 12, 2010 | 2001 Honda NSR 125 R

1 Answer

Bike wont kick start or idle , it will coast


first drain the carby, then set your air mixture screw 2 turns out, from the fully turned in position. The starting proceedure is as follows, when the engine is COLD, turn on fuel, pull on the choke fully, and kick the engine over. DO NOT use any throttle, when the engine is cold, and the choke is on. Remember Choke on, NO throttle.
When warm, no choke, and a little throttle when kicking.

May 12, 2010 | 2003 kawasaki KX 125

1 Answer

Wont idle unless i havethe throttle barley turned


The idle circuit is still plugged up or it would not be giving you this problem. Remove the carb and dis-assemble it then soak the parts in denatured alcohol for 30 minutes. Then use a spray carb cleaner to finish the job. Spray into all the little holes in the carb body. Especially spray into the air screw and throttle screw holes. Reassemble the carb and LIGHTLY seat the air and throttle screws then turn each of them one and one half turns outward. This is the factory setting. Before putting the slide back into the top of the carb, move the clip on the jet needle one notch lower on the needle. This will richen the low end fuel mix. Install a new spark plug and clean the air filter. Please rate my answer. Thanks.

Feb 08, 2010 | 2003 kawasaki KX 125

1 Answer

I need instructions on how to adjust a carburador in a yamaha Tw 2001


Turn the throttle screw and air screw inward until they LIGHTLY seat. Now open each of them one and one half turns. This is the factory setting. Now set the desired idle speed and then adjust the air screw for the fastest idle speed at the current throttle screw setting. If now too fast, reset the throttle and then reset the air screw to match.

Jan 02, 2010 | 2002 Yamaha TW 200

2 Answers

Strange thigs about YAMAHA TW 125


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

May 30, 2009 | 2001 Yamaha TW 125

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