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Rear suspension bottoming out? Need help...

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A friend of mine just bought an '07 YZ250F from a guy and when sitting on the bike the rear shock seems to bottom out after about 3-4" of travel. There is definitely a hard stop. We tried setting the sag, rebound and damping back the the factory settings. The sag was way off. This helped a little, but it is still only compressing about 4". What could be going on with it? Any ideas? We really need the help. Thanks.

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The shaft might be bent or something broke inside.  Remove the shock from the bike and remove the shock spring.  You should be able to push the shock down (without the spring) through it's entire stroke.  It should return to the fully extended position after a couple seconds after you stop pushing / holding it.

 

If you cannot push it through the stroke (which it sounds like you won't be able to), take the shock apart and look for obvious damage.  Youtube video shows how to do the service on them, but you will likely have to go to a shop to have them re-charge the nitrogen (probably charge no more than $25). 

 

If you take apart the shock (gain access to any part that has oil).. make sure you 1st bleed out the nitrogen!

 

A friend had issues with the valve heating up, expanding, and locking up inside the shock body.

Edited by mch

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It's more likely the linkage or swing arm bearings are rusty

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@ mch, "A friend had issues with the valve heating up, expanding, and locking up inside the shock body." is Christophe Pourcel your friend ? That's what he was complaining about to Moto Concept when he stopped in Texas :)

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@ mch, "A friend had issues with the valve heating up, expanding, and locking up inside the shock body." is Christophe Pourcel your friend ? That's what he was complaining about to Moto Concept when he stopped in Texas :)

 

No, it was actually a TT member rmzpegger.

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