Honda Trail 125 Forum

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  1. S

    Soot at oil fill plug

    Changed my oil at 100 miles (for a magnetic drain plug) and at the filler plug there was black soot/oil build up at the edge. Why? Pressure in the crankcase is coming out there, an area with a tight plug with an o ring. On a car engine the pcv valve would stick shut to cause pressure to escape...
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