Question about Yamaha TW 125 Motorcycles

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The bike starts ok with the choke but dies when i turn the throttle

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Being you did'nt say what kind of bike you have Yamaha has been making motorcyles since 1967 for sale in the United States and their still making them now. they make them in all sizes and some of them are fuel injection and they make 1, 2 ,3, 4 and 6 cyclinder bikes Then they make street bikes and trail (offroad) and mixture of racing bikes the answer to your question depends heavy on Make year and model. And if any equipment has been changed away from stock. If the bike is fuel injection it will not have a choke. If the bike with carbs has sit along time the air bleeds and even thefuel jets in the carboraters may be stopped up. some models have to warmup a fairly unreasonablely long time before they'll take the gas with the choke off. It's not wise to ride the bike around until this is fixed as the engine will run on the wrong mixture of fuel but it will put gas in the oil and wash the cyclinders down and generally ruin the engine.

Posted on Oct 01, 2010

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I can start my bike up, with full choke on, but after a few minutes it will die. Also, whenever I give it gas with the throttle, it immediately dies.


Something has to be fubar with the main jet circuit of carb. That explains why it starts and then shortly thereafter shuts down. Also explains why when you give it gas it cuts out cold.

U have ignition but NO engine will run without proper fuel flow.

Jul 31, 2015 | 1995 Triumph Triumph Thunderbird

1 Answer

Turns over but dose not start, spark plug sparking ok


Check you have petrol if the bike has not been run for sometime replace the fuel. Petrol ages and causes all manner of problems.
Are you trying to start the bike but it has gone onto reserve, move the fuel tap to the reserve position then try to start it. If the above fails, then try these:-
Is the spark plug wet when removed. If dry it sounds like the petrol is not getting through. Try opening the filler cap and leave it open, make sure the kill switch is in the run position. Try starting with the throttle full open. Does the bike have a manual choke try to start with the throttle shut, choke off, then full on, then while continuing to turn over move the choke lever in stages from fully on to fully off. I find on my Yam TW125 (winter and bad weather hack) that if I have not used it for a while sharp twist the throttle a couple of times no more than a third of a turn. Hope this helps.

Apr 08, 2014 | 2009 Daelim Roadwin R 125 FI

1 Answer

Husqu51 starts once but dies then just turns over


take off the muffler and try it if ok then open it up and clean the carbon from the screen

Apr 02, 2012 | Garden

1 Answer

2003 yz 250 starts and idles but runs rich and bogs as soon as the throttle is applied


Hi, Anonymous and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Accelerator pump leaking or no output.
6. Plugged bowl vent or overflow.
7. Fuel level in bowl too low.
8. Restricted fuel supply passages.
9. Plugged jets or passages.
10. Worn or damaged needle or needle jet.
11. The enrichner valve not seated or leaking.
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.
2002 yz250 idles fine but bogs and tries to die when twisting the throttle...
Bike dies when you give it throttle
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Mar 19, 2012 | 2003 Yamaha YZ 250

1 Answer

I have a 2003 ttr225 I can get the bike to start with the choke on ihave to let it warm up for an extremly long time before I can push in the choke . once the bike is warm and I hit the throttle hard ,...


Sounds like the idle circuit in the carb is restricted. The engine is running on the choke only. When the engine reaches a certain temp the fuelthat does get is more readily burned allowing you to back off the choke. The choke probsbly can't be completely opened? right? Fuel quality is also something to consider Oil content in fuel affects combustion temps and volatility. _good luck_Ned_



Nov 16, 2010 | 2003 Yamaha TT-R 225

1 Answer

82 suzuki gn250 bike runs with choke on , second chokes of bike dies. more throttle while choke on bike dies ????????????


sorry, dont have a solution, but was curious if you ever figured this problem out, i have the exact same issue

Aug 23, 2010 | 1986 Suzuki Rg 250

1 Answer

Bike starts right up in choke take it off choke shuts off


when you rejetted, did you also change the idle jets or just the main jets? if you didn't change the idle jets, that would probably help. remember you might also want to raise the float level height just a little bit to compensate for the extra fuel going out.

May 14, 2010 | 1993 kawasaki VN 750 Vulcan

1 Answer

Bike only runs with choke on or giving it throttle, when let off it dies


There are two possible solutions:

1. If you are sure the engine is OK then you can increase the throttle screw to increase idle race. The throttle screw can be found where the throttle wire connects with the carburetor.


2. If the bike is old or if you have not changed the engine oil on time then the bike needs piston ring replacement. This should be done as soon as possible to avoid more engine damage and effect savings on cash.

Aug 09, 2009 | 2001 kawasaki KLR 650

2 Answers

No throttle when cold


HI

It is clearly that you have poor mixture.
Every engine needs more fuel in starting, thats the reason for the choke circuit.
But yours doesnt work as you said
Fix your choke circuit in your carbs and every thing will be OK
If you had problem with your fuel pump your bike never run ok cold or hot it dies in any throtlle response

Mar 28, 2009 | 1990 Yamaha FZR 250 R

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