hi i recently just purchased a 2004 yz250f my question is if the serial numbers on the frame an engine case do not match does this mean it could have an engine from another bike in of did yamaha just throw together engine and frame numbers that do not match. I also was wondering if anyone knew the steps to changing the oil.

 

Hey..

Another good place to ask is Thumpertalk.com....

They have a great yz250f section there.... I would check mine for you, however its in my storage.... As living in apt sucks.. hard...LOL

Nick