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CB750K2 pressurization of the oil tank

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Marcelo750K2Pinho:
My CB 750K2 1973 is in excellent conditions, but i'm affraid about the pressurization of the oil tank and after a few minutes running, start to leak some vapours of oil thru the tank cover. This cover have a relief valve (like a radiator cover). What can i do to solve it? This pressurization is normal? The reief valve is miscalibrated? Since now, i appreciate your help.

falcostan:

--- Quote ---My CB 750K2 1973 is in excellent conditions, but i'm affraid about the pressurization of the oil tank and after a few minutes running, start to leak some vapours of oil thru the tank cover. This cover have a relief valve (like a radiator cover). What can i do to solve it? This pressurization is normal? The reief valve is miscalibrated? Since now, i appreciate your help.
--- End quote ---
pressurisation will probably be caused by worn cylinder bores/ piston rings/ holed pistons allowing excess pressure to blow by pistons and pressurise oil system, hope this is of some help to you, stan.

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