Question about 2003 Yamaha WR 250 F

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2003 Yamaha wrf 250 only runs with the choke on

I recently bought this bike from a friend due to a float bowl problem in the carb I have since fixed that and cleaned the carb at least 4 times. The bike runs good with the choke pulled out except for a slight throttle hesitation on the bottom end other than that it cranks fine even in the cold. the bike will not run at all with the choke pressed in. I know there is something wrong still,maybe timing issues i just dont know. someone please give me a tip its drivin me crazy, thanx.

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  • yo2yo Apr 07, 2009

    i have a yamha 250F and the timing is out 23 deg can this be adjusted???

  • j_jewell_887 May 11, 2010

    Thanx knight007 the original problem with the float bowl was that the rubber in the gas valve had *** apart and had stuck above the float needle and was causing the bowl to overflow i have since cleaned twice and I am pretttty sure its clean im not sure were the mixture screw is though that may be a good idea to find


2 Answers

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  • Master
  • 5,158 Answers

Possibly water in your fuel.... it's a small tank so just put about a quarter bottle of gas line antifreeze in the tank... it's alcohol so it will **** up the water. there is also the possibility the fuel is somewhat dirty... change the fuel filter as well


Posted on Feb 05, 2009

  • Roberta Smith
    Roberta Smith Feb 06, 2009

    Please consider bumping this rating to a fixya... thanks


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  • Yamaha Master
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Hi jjewel,
Theres seems to be some kind of restriction of gas flowing into the inlet valve at suction, have you set the mixture screw right?
Are the pilot and main jet free of obstruction?
Can you please let me know what was the original problem with the float bowl?
I may be able to post you more on the issue.

Knight. (Yamaha seca XJ750 '81)

Posted on Feb 05, 2009

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Turn on gas and gas comes out almost all the lines off the carb. bike has only been rode 2 times. Bike runs fine but choke doesnt work normally.

The problem is with your float inside the carb. It's either stuck or your needel/seat is sticky or there's a piece of trash holding it open. There are several causes but it's a simple fix.

The best solution is to tear the float bowl off and take a look. It can be done without buying any parts.

The proper float level for this bike is between 5.5 and 7.5MM.

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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.

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How to drain fuel from carb bowl?????

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2003 wrf 250 yamaha carb trouble

Just a thought, At first I would suspect low cicuit on carb being plugged or mixture passage. But after reading your cleaning carb I would be inclined to say check your timing as long as you are sure your carb is cleaned well and adjusted.

Feb 05, 2009 | 2003 Yamaha WR 250 F

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2003 yamaha wrf 250 carb problem

(1) You will need to adjust the float pin to get the correct amount of fuel in the float chamber of the carburator.
(2) You will also need to set the air-mixture screw , but before you do tht remove the spark plug and see whats the condition of it, is it black , is it brownish, or is it whitish.
If its blackish = means rich too much of fuel, if its browinsh= ok, if its whitish = its too lean.
(3) As for hesitation, check the needle at carbs piston on the accelerator cable, and blow the main jet with high pressure.
(4) Check too the spark plug gap and if its as per the manufacturers specs.

Hope this helps!

Feb 05, 2009 | 2003 Yamaha WR 250 F

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Yamaha 2003 wrf 250 start probs startermotor easily turns over motor but very rare 4 bike to start kick starts ok but abit hard to start cold

hey m8,, sounds like u have a bit **** in the carb floating arround the jets m8,, wen its warm and bein used the dirt will flow round the carb untill left overnight to settle ,,that will block the fast idle jet,, need to take the bottom of the carb off,,ie the float bowl wip out the jet that the needle sits in to,, this will have about 4 little holes threw the stem of the jet, poke a pin or needle threw them and the main jet,, untill u see light threw the holes,, clean out the float bowl,, that should sort it,,

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