Question about 2004 Yamaha YZ 250 F
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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Posted on Jan 02, 2017
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