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

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  #11  
Old 4 Weeks Ago
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The carb body has one screw, the Idle Mixture Screw, located top rear center by the manifold flange. Looking down the throat, off to the left is the idle speed/throttle stop screw, and on the right in with the choke assembly is the fast idle adjust screw.

I think I figured out the mystery vacuum port too. The one that's capped was added for VOES in '83, then the one in the back on the manifold flange (the one that's in use now) was added for the same purpose in '84 but they didn't bother to remove the earlier one. So make extra sure that port is actually capped and isn't leaking!
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  #12  
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The second port is for purging a charcoal canister.
Most have been removed (if it had one).
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OK, thanks guys...if the owner of the bike has not signed up here and come to this thread..then we can close it here...can only try and help so much...

Have sent him the link not here a couple of times and said to sign up...if he has not ..his loss
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  #14  
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The port behind the throttle plate is for the VOES, the port closer to the air filter is for the canister purge.
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