Question about 2003 Yamaha WR 250 F

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2003 wrf 250 yamaha carb trouble

The bike runs great with the choke pulled out but will not run at all with it pushed in. there is a little bottom end hesitation and I know something is still not quite right about it. I have bought a brand new plug an tried new high test fuel none of wich seem to work I have also taken the carb apart "obviously" to clean it and I am pretty sure its being put back together properly becuz of consistent symptoms. ANY idea's?

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Its getting not enough fuel the carb just needs to be ajusted

Posted on Feb 06, 2009

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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.

Posted on Feb 05, 2009

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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

When pull the choke on my cv carb the bike runs great when i push it in runs like **** can you help


Sounds like the bike has been sitting for awhile or trash has gotten in the carb and the slow speed jet is plugged up. This means that not enough fuel is getting to the engine. You need to remove the carb from the bike and go through it completely.

This is not a job I recommend for an amateur mechanic on the original Keihen CV carb. There are several areas where you can get into trouble when reassembling the carb.

Now, if you disconnect the fuel hose, the throttle and idle cable and the choke cable at the knob end, you can take the carb to a qualified mechanic, have it cleaned, and then reinstall it.

Good Luck
Steve

Dec 19, 2010 | 2000 Harley Davidson XL 1200 C Sportster...

2 Answers

1995 Yamaha XV 250 Virago Is there a need to adjust the choke (start) cable? If so, how is it adjusted. I think I'm having a problem with my choke and was planning to replace the cable and starter...


The problems with a plunger style choke happen when the rubber on the bottom becomes deformed and does not seal or the spring does not push the plunger down hard enough, or the cap breaks so the plunger is not pushed down hard enough. If you put your finger over the hole and the bike runs properly your bike is running on choke. You have to block the hole deep inside the carb to shut off the choke. I assume the original problem was that the bike would not idle .If this is the case, take the carb apart remove the slow jet and clean the jet and the carb body out so fuel will flow at idle. This should fix your no idle problem.

Jun 26, 2010 | 2002 Yamaha Xv 250 Virago S

2 Answers

VERY hard starting takes way to many kicks usually play out befo


There is a proper way to start the engine. Four controls are on your bike to assist in starting.
  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. Give a strong kick through the full sweep of the kickstart lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from a backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

Top rating for this answer? Thanks!

Jun 11, 2009 | 2003 Yamaha YZ 250 F

1 Answer

2005 250 f 65 kicks to start


Several things can cause the problem. First, spring for a new spark plug. The stock plug is NGK CR8E. Now the plug is eliminated as a problem. Next, pull the slide out of the throat of the carb. Now remove the jet needle. Put the needle clip on the 4th notch, (this is the stock setting). Use only premium gas. Next, follow the starting instructions below.

There is a proper way to start the engine. Four controls are on your bike to assist in starting.
  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. Release the de-compression lever and give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from a backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery and clean air filter will also aid in starting.

This will likely tame the beast for you. Please rate this answer. Thanks!

Jun 06, 2009 | 2003 Yamaha YZ 250 F

1 Answer

Bike runs well then dies


i would try cleaning the carb out & flush the tank,then try new gas.that should work.ive never heard of it being eletrical.

Apr 27, 2009 | 2003 Yamaha YZ 250

1 Answer

Gas in oil - Yamaha Virago 250 2006


your carb. is flooding the cylinder when its not running.it will cause ring damage.turn your gas pitcock off when not in use.get carb cleaned &adjusted.

Apr 23, 2009 | 2002 Yamaha Xv 250 Virago S

1 Answer

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

2 Answers

2003 Yamaha wrf 250 only runs with the choke on


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

Robert

Feb 05, 2009 | 2003 Yamaha WR 250 F

1 Answer

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,,

Dec 31, 2008 | 2003 Yamaha WR 250 F

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