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05 yz250 shock stiffening up over ride

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i apologize right know if this topic has already been discussed but i could not find anything. my bike when i get on it before a moto is soft and perfect but at the end of a moto when i get on it the suspension is hard as a rock. my front end is perfect but my rear shock is giving me that problem i just described. is this usual and if not what do you recommend to fix it.

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From what I have seen in the past, you need to have the shock rebuilt and a new style piston band installed. KYB shocks of this time frame ran a duel o-ring behind the piston band and no hole drilled in the band. What tends to happen is junk and air get trapped behind the band and don't have a way to vent. If air gets behind (most likely because the shock is well past service intervals) the band, as the shock heats up the piston gets tight in the body.

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