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  #11  
Old 21st September 2018
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Doesn't matter about the little rubber mushroom valves. They are just to keep the oil from draining back down too fast...
When on tour I had enough oil blowing past those valves to soak the air filter after about 400 miles that it caused my bike to run rich and I had to top off the oil bag. I had another 1400 miles to go and didn't want to continue putting up with the issue so that evening I pulled the mushroom valves, cleaned them and put them back in. That stopped the oil from blowing out of the breathers and fouling up my air filter which has remained clean for the last few thousand miles nor have I had to top up the oil.
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  #12  
Old 21st September 2018
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the valves will loose their ability to control c/c gases as they age, even though the seem pliable in your fingers, not so much while working so replacing is the way to go.
they have nothing to do with the oil draining back down, that is up to gravity and c/c pressures. the oil vapor goes through a separation compartment where the oil is coalesced. when you have more vapors than the system can handle, it will carry out the valves to the outside world.
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  #13  
Old 21st September 2018
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the valves will loose their ability to control c/c gases as they age, even though the seem pliable in your fingers, not so much while working so replacing is the way to go.
they have nothing to do with the oil draining back down, that is up to gravity and c/c pressures. the oil vapor goes through a separation compartment where the oil is coalesced. when you have more vapors than the system can handle, it will carry out the valves to the outside world.
I assumed he was talking about what the manual calls umbrella valves. They do keep the oil from draining down on the intake side. That keeps liquid oil from being sucked into the air cleaner. They do not prevent oil nor pressure from returning to the lower parts of the engine since there are no umbrella valves in the exhaust side holes. Only the intake side has them.
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  #14  
Old 21st September 2018
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I assumed he was talking about what the manual calls umbrella valves...
Yes, exactly... #23 in the diagram. It's my impression they are essentially PCV valves which is why I bothered with them in the first place and they obviously were the issue. Mine were fouled and would allow air to flow in both directions but the valves themselves were still flexible and once cleaned they sealed well enough to prevent air from getting sucked back in. That was confirmed by a simple blow test through the head breather bolts.

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Old 21st September 2018
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That illustration shows what must be the later model one way valves. The earlier umbrella valves look like this.



They probably both do the same thing, just different appearance. I believe these were used from about 1992-2003.

I should not have said the umbrella valves had nothing to do with spitting oil since a bad umbrella valve could cause more oil spitting. They do not have anything to do with the engine wear that lets more blowby through on older engines.

Last edited by Graywolf; 21st September 2018 at 19:21..
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Old 22nd September 2018
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well, it makes no hill of beans which side they were designed in, would they work if on the exh side of the head ?, SURE! has zero to do with the valves!
the diff would be the mounting of the air cleaner to the heads which ports the c/c vapors to the air cleaner.
oil drains via the p/r tubes and rifle hole to the flywheel compartment.
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  #17  
Old 22nd September 2018
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I guess you can put your umbrella valves in the exhaust side if you want to. Makes no difference to me. I will continue to put them in the intake side.
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Old 22nd September 2018
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I have run several EVO sportsters up over 100,000. it is an engine that is a great bike engine.

My secret to long sportster life, about 75 HP is good, bronze oil pump gear, top end job around 65000 ish, Owning a GSXR 750 for track days, my sporties are my DDs and around town bikes. They are a bike I started riding in the iron head days and have never found a more balanced bike.

lets put it this way, there is a huge reason 30 + percent of HD sales are Sporties. It aint price, it is because there is such a huge following for the platform. It is that good of a bike.

tell the truth, I can not decide if YAmaha or HD has a better big twin right now, but I can tell you who rules the middle weight market.
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Originally Posted by Diogenes415 View Post
Yes, exactly... #23 in the diagram. It's my impression they are essentially PCV valves which is why I bothered with them in the first place and they obviously were the issue. Mine were fouled and would allow air to flow in both directions but the valves themselves were still flexible and once cleaned they sealed well enough to prevent air from getting sucked back in. That was confirmed by a simple blow test through the head breather bolts.

part of the genius of the Evo Head. It works in so many realms, smog is one of them and let HD move on as other marks were trying to get their designs to meet CARB. I think the Evo sportster can last longer non water cooled than the BT ever will.
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  #20  
Old 24th September 2018
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Originally Posted by Graywolf View Post
... They probably both do the same thing, just different appearance. I believe these were used from about 1992-2003...
Yup, the valve units as used in say a 2006 Sporty (pictured below) contain a one way valve like you posted a pic of... it's the green thing.



Quote:
Originally Posted by Graywolf View Post
... They do not have anything to do with the engine wear that lets more blowby through on older engines.
Agreed, but from what I've read on forums it seems some people automatically assume that excessive oil vapor coming out of the breathers is a product of blowby instead of acknowledging that crankcase pressure differentials are a normal occurrence in an internal combustion motor and rely on a properly functioning PCV valve.


Quote:
Originally Posted by jammantoo View Post
part of the genius of the Evo Head. It works in so many realms, smog is one of them and let HD move on as other marks were trying to get their designs to meet CARB. I think the Evo sportster can last longer non water cooled than the BT ever will.
I think the Evo Sportster motor is one of the simplest, robust and beautifully designed motors to have ever been produced.
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