Question about 2004 Yamaha YZ 250 F

2 Answers

Yzf 250 wont run without the choke

Bike will not run if the choke isnt on. in other words it starts then as soon as you push the choke in it stalls please help!

Posted by on

  • 2 more comments 
  • mikelapt Feb 17, 2009

    thanx very much for the help. didnt think there were people like you out there. much appriated!

  • katiedidit72 Mar 08, 2009

    I have a 2005 Suzuki LT80 for my boy that is doing the same thing. It'll run all day long with the choke on, and if you give it throttle with no choke it'll run up and down the street just fine. But as soon as I stop, it idles down then dies. Will start right up again. I've cleaned the air filter, tried adjusting the idle, and disassembled the choke and cleaned, but got nothing better. Even dumped some ring clean in the tank and ran it full throttle up and down the street a bunch of times. Any thoughts? Can I pop the choke off and spray carb cleaner in there?

  • fmxboardergo Apr 21, 2009

    I have a 2004 YZF250. It sat for about 2 years until I recently started it again. It runs great with the choke on but dies out when I turn the choke off. I am assuming something in the normal run circuit of the carb is plugged (old gas has gummed up maybe?).

    If so, can I open the carb and clean it without totally screwing up it's settings?

    Can I clean the carb without taking it out and disassembling it...?

    Any suggestions?

  • maddog011 May 11, 2010

    it sounds like you need to adjust how much fuel is going in. have you checked it all?



2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 1,512 Answers

Hi mikelapt
You will have a carby problem. When the choke is one, and different fuel circuit is used. When you turn off the choke, you go back to the idle circuit of the carb is used, when under throttle, main jets kick in. You probably have a blockage in one of these circuits. Strip the carb down, clean with carby cleaner, blow out all air circuits and jets with compressed air, then setup the idle mixture and tick over speed. Always work with fresh fuel, and drain off, discard any fuel older than a couple of months. It goes off, and turns to a gel  like substance that blocks up your carby. Hope this has explained your problem. Happy to talk to you more about it. A FixYa vote is a great reward for for my time taken to explain this to you. Cheers
regards robotek

Posted on Feb 08, 2009

  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 2 Answers

Your low speed jet is pluged. You will have to remove the carb then remove the screw in the float bowl. You will see a main jet and a pilot jet. You will have to remove the brass plug that covers the air ajust screw. Then turn it in to find out how many turn till it bottom out. Then remove the screw and take carb cleaner and blow out all passages.Then reinstall all jets. Hope this helps.

Posted on Feb 16, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

2005 Honda CRF 250 R won't run without the choke on

Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
bike wont idle without choke on why
Honda 2004 CRF250R Service Manual
Honda CRF250R Owner Manual Competition Handbook

Jul 16, 2012 | 2005 Honda CRF 250 R

1 Answer

I have a 1995 kawi 750 and at idle she runs great but as soon as u go to ride and get to 5000 to 6000 rpm it will just die but if u push in this black little button under the clutch or play with it a bit...

triple check choke? Is it staying on once warm? Mine was cable and siezed and choke on to start from cold, when it warmed up it turned out choke was stuck half on. Like if you ride then whack choke on it stalls?

Mar 15, 2012 | 1995 kawasaki ZXR 750

1 Answer

Hi there i have a 2004 Yamaha YZF 250 that will run on choke then push the choke in as soon as u give it throttle its bogs an back fires then dies or u can build the revs it runs jst bout thanks

Would almost certainly be blocked pilot jet and pilot circuit a classic symptom of this is running only with choke on
buy new pilot jet an compress air clean the hole the pilot jet screws into
regards Jamie

Aug 28, 2011 | 2004 Yamaha YZ 250 F

1 Answer

My bike wont start over night

try turning the choke on,which is on the left handle bar next to the grip,leave on ,twist throttle full then close it,press start button,should start,let run for a few mins then turn choke off,

Jul 13, 2010 | 1999 Yamaha YZF-R1

1 Answer

Kawasaki Ninja 250 running problem

This could be due to timing screw being incorrectly set
Locate gold timing screw on the carbrettta turn it clockwise only slightly till bike idles without choke on, Then when choke it on it should idle a touch higher.

Jun 21, 2010 | 2008 kawasaki Ninja 250R

1 Answer

1995 yzf 750 wiring diagram, starts wont rev

Hi and welcome to FixYa,

Would the wiring of a 95 YZF750 R/SP European model help?

Good luck and thank you for asking FixYa.

Nov 07, 2009 | 1995 Yamaha YZF 750 R

3 Answers

Bike has been standing for 18 months without the engine being spun. Bike will not start without choke. when choke is off engine stalls

You need to completely drain and refill the gas - the gas you have is stale and doesn't have enough power to run the bike.
The battery needs to be fully charged - not just jump started. It wouldn't hurt to do an oil and filter change as well as a air filter and plug change.

Jul 01, 2009 | 1995 Yamaha FZR 600

1 Answer

Yz 250 4-stroke It's extremely hard to kick over, so it has a pressure release lever on the handle bar. Is there some "proper" way to kick it over, or do I just kick it while holding the "pressure rel

That lever is a compression release and pulling it will make kick stating an excersie routine. Kick start without the pulling the lever. See how that works. good luck.

May 29, 2009 | 2004 Yamaha YZ 250 F

2 Answers

Bike died during poker run

I would eliminate the possibility of bad gas first, considering you had just filled up. Move on to the other possibilities after eliminating the simple ones first. Battery, spark plugs, plug wires, other ignition problem, fuel delivery problem.

May 24, 2009 | 2000 Suzuki VL 1500 Intruder LC

1 Answer

Will not stay running without the choke on

check to see if your carbs. are on tight. 2. might have stopped up low speed jets,might have to clean carbs. synchronize them.check air filter and sparkplugs,and gas line filter.

Mar 24, 2009 | 2001 Yamaha YZF-R6

Not finding what you are looking for?
2004 Yamaha YZ 250 F Logo

1,806 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts


Level 2 Expert

281 Answers


Level 3 Expert

899 Answers

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1147 Answers

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

Answer questions

Manuals & User Guides