Question about 2003 Yamaha WR 250 F

3 Answers

Engine wont hardly run when the choke is pushed in?

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  • frank_hutto May 29, 2011

    It runs ok sort of with the choke out-does this mean the main jet is plugged? Where is the main jet in this carb? Can it be accessed without taking the carb completely apart?

  • frank_hutto May 29, 2011

    why does my wr 250 not run for **** with the choke pushed in. It runs only with the choke out

  • frank_hutto May 29, 2011

    My wr 250 2003 model starts and runs with choke pulled but even when warm it barely stays running. when you gun the throttle the engine just dies. what do you think is wrong?

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  • Yamaha Master
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Assuming your air filter is clean, and your valves are not out of spec...
Your choke just adds more fuel to the engine. If after running for a bit, and you push in, or turn off the choke, and it won't run, you should look into a plugged jet, or even build up of old fuel in a pilot or main jet. On the bottom of the carb is a 17mm hex plug, also a drain, that if you remove it, you can get at the main jet and the pilot jet. Make sure these are clear and you can see light through them when removed. Also, ...the pilot jet has small holes through the sides, so make sure they are also clear. The pilot uses a slotted screwdriver as the main uses a 6mm socket to remove. (Do not over tighten on installation. While the plug is out turn on your fuel petcock to ensure that fuel is flowing into the carb.

Posted on May 29, 2011

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  • Master
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When the choke is all the way out, it should be getting the max fuel flow so its running.But as soon as you push choke in, the fuel flow is getting low, then required so the engine is hard to start.Get the fuel line checked, there is a blockage to fuel.Also get the carbs clean, there is dirt causing the fuel to flow.RE- check the air filter.--------- This will help.Thanks.Helpmech.

Posted on May 29, 2011

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  • Master
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If old gas sat in the carb.s for more than a month it starts to dry up. As it drys up it leaves behind a varnish like film that stops up some very small ports and pin holes inside a motorcycle carburetor. It is also very hard to get out. You can try this before you pull the carb.s for a full cleaning.Use a product called Seafoam, get as much gas out of the carb.s as you can. use a turkey baster and force the seafoam into your carb.s fuel line that you take loose from the fuel tank. Let that set for say 1 or 2 days. then hook up the fueltank with a mix of good gas and seafoam, (not a lot but enough to start it up. Move the cycle outside as the seafoam will make a lot of smoke if it does start up. If that does not clear up the problem you may have to pull the carb(s) and remove the blows to clean the inside. If you have to do that do not DO NOT MESS with any adjustment screws. Just take the carb. bowl off. Do not mix up any internal parts. It is best to work on a large sheet so if you drop a small part you can find it, you do not want to be missing some tiny spring or screw. Hope this Helps Fix Ya Up..

Posted on May 29, 2011

  • John Fourteen Six May 31, 2011

    I do believe your carb is a bit dirty inside. The symptoms you are describing, sounds like a clogged up carb. You may be able to remove the fuel bowl and clean that. But getting the float and needle back on may be very hard in the position. Pull the carb off and get it on an old towel and clean her up.

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1 Answer

Start OK but if after warm up I push the choke to run, the engine stops, I used 4 time before and idled OK


Push choke to run???then not use on a all ready warm engine you mean you push the GAS lever ? remember a choke can work as a throttle for the engine. it can have a double function if your electric start contact is damaged you can use it to stop the running engine also.
How long you are owner of the machine , read the manual about it !
If before it worked good on this kind of proceedings as described ? then if you mean you push the gaslever to run Try it to do it again without the airfilter. I THINK YOU HAVE An AIR problem by carburator if its so clean the airfilter if its not to old. or replace
You can use for short time the choke in most cases minimize use of the choke short not more then 2 times max you pull.or electric start.
AND very important control in any case allways for THE RIGHT OIL level !!

If the engine is warm(hot) do not use the choke forget it it has no use. control your spark plug electrode i think you will find the cause.

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