YZ-250F 2003 Blown Cylinder Head

[Roma]

I was riding the other day and my bike started to sputter on the top end. I thought there might be a leak in the intake boot but that was not the case. The next thing I knew the bike stopped after landing from a jump. I pulled off the Cylinder Head and it is badly damaged. Two of the valves broke off. I never adjusted the valves once nor did I on my 01. I guess I figured when it became hard to start it would be time. It started on the first kick that day. Now I have some questions. Where can I find a cylinder head cheap? Rebuilt? Who has the best deals on them? Can it be repaired? It looks like it's dinged up pretty good. I still like Yamaha's even though this happened. Any advice appreciated.

 

[Roma]

My local dealer said the crank bearing might have started to loosen up and caused the piston to hit the valves. I thought only the 01 had crank issues

 

[Rich Rohrich]

My local dealer said the crank bearing might have started to loosen up and caused the piston to hit the valves. I thought only the 01 had crank issues

It's possible that the main bearings are worn, but they would have to be really worn to allow that degree of piston movement.

I never adjusted the valves once nor did I on my 01. I guess I figured when it became hard to start it would be time.

I'll bet your statement above is probably why it broke a valve.
You can't ignore the service intervals indefintely without paying for it at some point.

It's a 13,500 rpm RACE ENGINE, it's not a John Deere garden tractor.

 

[Roma]

I got spoiled by by 01 but only kept it a year and 1/2. I was hoping to make it until the 07 came out. Now I'm paying the price.

Does anyone repair cylinder heads or sell used ones?

 

[Rich Rohrich]

You can check with Eric Gorr and see if he has any refurbished heads left in stock ericgorr @ hotmail.com