SOURCE: set the timing on a yamaha 250 bruin 4-wheeler
make sure the pison is on top dead centre(look through the small timing plug hole down the bottom) There is a punch mark on each cam sprocket that aligns with the cylnder head surface. the cam lobes facing away from the lifters
Im trying to up load an image of the page in the manual
You will need to replace the head gasket. Tightening the head will not work once the oil has found a path to leak out.
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