DavidOfMA
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Getting back in gear after a long time away
Posts: 336
Beverly, MA
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I had a similar set of leaks, one from the head plug and some weeping oil from the nut. (I took Dave's advice and cleaned up the area then rode with a piece of rolled-up cloth to see which side got oily, and both sides did.)
Somewhat amazingly, cleaning up the area with carb cleaner stopped the rubber plug leak, and using high-temp, wicking Loctite on the nut and washer stopped that leak. I used Loctite 294, which is oil-tolerant and wicks into the threads without need for disassembly. So far, after 1000 miles of hard riding, I see no leak from either place.
If that doesn't work, you'll need to take things apart to replace the copper crush washer and snug that bolt up again. In my case, if it leaks in the future I'll probably need to heat the nut to remove it.
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