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XL 600 r motor leaking oil

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My 86 honda xl 600 r is leaking some oil somewhere on the left/top side of motor. I am new to riding and am curious of anyone can look at these picture and tell me what they think it could be. My buddy recently replaced the gasket so I would assume that should be good but who really knows! Thanks for the help!

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Probably from the rocker shafts by the look of that. Clean it with kerosene or similar and run it till its obvious. 

Yup X2

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They're not o-rings, they are copper crush washers like those on brake hoses and the oil feed banjo bolts.  Those surfaces that they seal on get squashed and not alway flat after they've been torqued down a few times. I milled mine flat again and made some thicker copper washers plus then a little RVT on the threads, Dry as a desert.

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