Two Stroke Motocross
TSM Racing => YZ Project 2018 => Topic started by: rsmith on May 21, 2018, 08:42:41 PM
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We picked this good looking used 2013 YZ250 up to document the process of inspecting and refreshing a used bike.
Longer term it is going to be a "test mule" for product tests and will be part of a really cool, but as yet to be announced, series.
Stay tuned.
(http://www.twostrokemotocross.com/images/TSMProject13YZ250.png)
--Ron.
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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.
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Nice, cant wait for this tear down and inspect/make right continues !!
OnS