I recently picked up a 04 YZ450f that has a seized con rod. The crank can still move but the con rod wont rotate. I'm wondering what could have caused this I've been thinking oil starvation was the problem and want to redo the bottom end right and make sure it is completely clean of dirt/debris.
My question is what should i really look for to replace and how can I flush the oil system in the frame of dirt/debris because i found one of the oil lines coming from the engine to the frame to be damaged and had alot of dirt around it. Is there a way I could dump some diesel through the frame oil system to clean it out?
any insight is greatly appreciated, I'm a bit new to the Yamaha 4 strokes