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.
http://www.cmsnl.com/yamaha-yz250fr-2003_model11247/partslist/

Posted on May 11, 2010

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When you say "brake down", do you mean "break up"? As in the engine starts backfiring and missing and/or popping and will not rev past 7,000 rpm's? If this is the case, then it's likely a carburation issue. This condition is usualy called "breaking up", as the engine begins popping and loosing power. It will almost sound like it hit a rev limiter. My suggestion is first off, check the basics. Air, fuel, spark. Check for air restrictions and possible air filter obstruction or passing of forign material. Fuel system and filters/restrictions should be checked, as well as the fuel quality. And spark componants from plugs, to wires, to leads, etc. If the issue persists pnce you've got a fresh tune up on the engine, next get the carburators synchronized with a vacuum gauge set. This will ballance the carburators out, and if it's a 1999, even if it isn't the entire problem it's something that's definately long over due. A "carb ballance" is esential for any vacuum opperated carb system, as if the adjustments go out of spec on individual carbs, some may run lean while others are rich. If a cylinder runs lean then it will be the first to start "breaking up", as it doesn't have the mixture neccessary to maintain combustion and it will start by dropping that cylinder, and so-on and so-on. From there if it's still breaking up, go on with further diagnosis and testing of the rest of the fuel system. Things such as clogged main jets, clogged and or stuck carb floats/needles/seats, or even clogged air jets can cause this issue. I would "overhaul" and re-gasket the carbs at this time, as it will save hassle and money in the long run. If you're taking them apart to inspect, clean and re-seal them while you're at it. After carburation checks are complete if the issue is still present I would head to the ignition system. Check your ignition coils, check your pick up lead, etc. After that.... That engine's broke! the Stick

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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.
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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.

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