Question about 2003 Yamaha YZ 125
Most likely the head gasket. remove it and make sure the surface on the cylinder and head are flat, and replace the gasket if they are good. Be sure to torque the head bolts and tighten in a criss-cross way. (Inspect the old gasket to verify where it leaked.)
Posted on Sep 26, 2009
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Posted on Jan 02, 2017
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