I started on the tear down and evaluation. No surprise the fork seals were leaking, I noticed that when we were evaluating it.
![](http://www.twostrokemotocross.com/images/YZ250LeakySeals.jpg)
This was a bit disappointing but not surprising, the original owner said he never serviced the forks.
![](http://www.twostrokemotocross.com/images/ForkOil.jpg)
This on the other hand was a completely unwelcome surprise.
![](http://www.twostrokemotocross.com/images/FreePiston.jpg)
From what I learned exploding free pistons aren't all that uncommon. Supposedly they fixed this after 2009, but this is a 2013 so draw what conclusion you will from that.
The upside to this is that a couple of different companies makes aluminum free pistons for it that are open on the sides to prevent the over pressure that causes this failure.
![](http://www.twostrokemotocross.com/images/FreePistonReplacement.jpg)
Next time I will show you why it is important to take your brand new bike apart before you ride it.
--Ron.