Question about 2004 Yamaha YZ 250 F

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My 03 yz250f is breaking down between 3000 and 5000 rpm. Have cleaned carb and checked all electrical components. What could be wrong

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Have you checked elec. components with a multi-meter to see if they retain the original resistance values. A service manual has these figures and meters are about $40. Generator or stator coils provide current at certain speeds, the CDI unit sorts this out basically. If all connections are 100% secure and a new plug of the correct type is fitted, jetting maybe the culprit, pilot jet in particular. Try different # either side of your current size. Presume no air leaks or obstructed air-box. Fuel must flow freely when instant more is required, faltering may be caused by a fuel vacuum till enough is delivered to fire. Check line for kinks or expanded inner lining...filter clean?
This site may help with things....Cheers.

Posted on May 11, 2010

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could be both clean out all carb jets first and change the plugs for a new set also have a good look at the air filter if it still missfires its likley to be coiles

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I have a 1999 gsxr 750 that starts to brake down at 7000 rpm

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I have a yz250f 2001, and it splutters at low-mid rpm. Once you get the revs up, you can keep them there if you nail it ?? It runs fine??

Assuming your valves have been checked, and the air filter is clean...
You carb has an accelerator pump, and these can get corroded. Make sure your carb is thoroughly cleaned.
There is an air idle adjustment screw on the bottom, that will affect starting, and idle.
The last issue could be a slow jet that may be too rich or lean. This will affect from idle to 1/4 throttle. The best way to read it is run it there for a while, and remove the plug to see the color. Too white is lean, and black sooty is too rich.

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carbs need a good cleaning. had this same problem with an 82 GS1100. cleaned the tank as best i could, you can never get all the rust tho. finally had an idea to place a couple of old car speaker magnets on the outside bottom of the tank to catch any residual rust. been 4 years now with no more problem.

Apr 04, 2009 | 2003 Suzuki GSX-R 600 40 Anniversary

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1998 Hond CBR 600 goes flat at 5800 rpm

I believe that you should give the carb jets a clean as this sounds like a fuel delivery issue. there is no electrical reason why there should be a break in performance like that.

Feb 24, 2009 | 1998 Honda CBR 600 F(3)W

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