Overflow tube issue

pyoungbl · 08-17-2016, 10:28 PM

With our 250cc single, I wonder how much pumping action we actually have. I suspect we are not looking at a large volume of air being moved up into the airbox. It's more like a fixed volume being pushed back and forth along the hose going from crankcase to airbox. Of course the vacuum at the air box will suck from the crankcase but it's not going to be a hurricane flow of air in that tube.

I'm still interested in figuring out why some Zongs have high concentrations of fuel in the crankcase, as well as why some have a bunch of liquid in the drain valve. If all had these issues it would be easier to figure this out but some do and others don't.

08-17-2016, 10:28 PM	#10
pyoungbl Join Date: Feb 2016 Location: Portsmouth, Virginia, USA Posts: 632	With our 250cc single, I wonder how much pumping action we actually have. I suspect we are not looking at a large volume of air being moved up into the airbox. It's more like a fixed volume being pushed back and forth along the hose going from crankcase to airbox. Of course the vacuum at the air box will suck from the crankcase but it's not going to be a hurricane flow of air in that tube. I'm still interested in figuring out why some Zongs have high concentrations of fuel in the crankcase, as well as why some have a bunch of liquid in the drain valve. If all had these issues it would be easier to figure this out but some do and others don't.
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