Oil pressure too high

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Prowelder

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I have a 94 Honda 15 horsepower 4-stroke engine starts on half a pull runs great except oil pressure builds up. It blows the dipstick off and and squirt oil after running full speed for couple of minutes

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I doubt the oil pressure is too high but I bet the crankcase pressure might be too high. Non functioning crankcase vent, excessive blowby come to mind also.
 

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