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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #31  
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Please post a pic of the fitting on top of your case.
And do not plug the transmission vent.
Trans vent has nothing to do with the tank vent
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  #32  
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Quote:
Originally Posted by needspeed View Post
If the blue line is venting the engine, you should be able to pull the blue line off the tank, blow air in it and air should come out the breather tube on the cam cover. It shouldn't work in the other direction if you've got the 1977 one way valve between the tube and the cam cover.

This way you can verify that you've got a vent connection between the engine and the tank. If you do, then I guess it's all good.

But you will still have a mystery.
Confirmed, just pulled that line from the tank, blew into it... and after some gurgling oil sounds, got air coming out the breather tube.
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  #33  
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Quote:
Originally Posted by Hippysmack View Post
Please post a pic of the fitting on top of your case.
And do not plug the transmission vent.
Trans vent has nothing to do with the tank vent
Just did one page back, it wasn't how I remembered it and I seem to have accidentally assumed it was on the case. Trans vent is to atmosphere, that's how I have it now.
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  #34  
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needspeed needspeed is offline
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Mystery solved. Good work.
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  #35  
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Good...……….
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  #36  
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There are people on this site that added their personal views based on experience and got you to the right answer. This thread certainly was one of them. Good luck with the build.
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  #37  
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Quote:
Originally Posted by sungod View Post
There are people on this site that added their personal views based on experience and got you to the right answer. This thread certainly was one of them. Good luck with the build.
Absolutely, such a great community here, got me through my issues more than once!
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