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2001 yz125 powervalve question

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I picked up a 01 yz125 a few weeks ago and I'm working on freshening everything up. Replaced all fluids and cleaned carb. Put in a new shift shaft and starter assembly. I noticed some black oil (like exhaust spooge) leaking for behind the screw that holds the powervalve rod in. I'm assuming its the seal behind the hole. Will I have to take the cylinder off to do this? Will it hurt to just leave it and let it leak some? I just wanna know before I put very thing back together. Thanks!

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