Quote:
Originally Posted by Laird Scooby
I'm wondering if you've hit the nail on the head and the direction of flow has been inadvertently reversed? Would explain a lot if so!
OP - could be worth swapping the hoses around so the oil filler hose goes to the air cleaner and the vac stub on the inlet goes to the oil separator (going from memory of what was on my last 140 many moons ago and the pic above)
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Unfortunately, the hoses are configured correctly as per the attached diagram from the service manual.
I will explore placing a metal orifice disk with a smaller orifice inside the manifold nipple which may restrict the vacuum flow whilst still function to extract gasses from the crankcase.