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lc4 640 head oil leak

  1. Supermoto
    Hi, I have finally located where my oil leaks coming from but don't know what it is or if / how it can be tightened?? It's right at the front of the engine, at the top, on the head. It's a small round thing, about the size of a new 5p, wedged right between both exhaust manifolds. I cleaned all...