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Hi i have a 1999 d9 and it is suffering from high crank case pressure,

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Hi all i have a 1999 d9 which has very high crank case pressure to the point of blowing oil into the air box i removed the breather and ran the bike to try and identify the fault and found bike ran smooth with no exhaust smoke, does anyone know if this could be a failed head gasket between cylinder and oil passage causing pressurising of the crank case any help woul be mutch appreciated
 
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