07 KTM 125 power valve axle bolt

When washing my bike I noticed a bolt on the jug leaking what looks like grease. I searched the bolt and its the power valve axle bolt. The bolt on the left side of the cylinder is the leaking one. On the right side it's completely fine. What caused it to be leaky and how do I fix it?? Thanks a ton

there is an o-ring on the axle, just replace it...BUT be sure to get the axle back to exactly the same number of turns in or it may bind the flapper

Thanks Mike ill check it out!

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