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I, have 88' model DT150 and on the engine diagram it shows an upper and lower lubrication tube with a check valve in the middle it starts of from a port tube near the oil pump and goes up to a port at the top part of the crank, my question is, should there be a lot of bubbles blowing thru it mixed with some oil when its running?, or should it be solid filled with oil? thanks to anyone who can shed some info on it.