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For two months now I've been trying to determine the problem with my #3 cylinder which shows signs of a rich running condition by a black soot covered plug end. I am in need of the opinion of someone who has been into these carbs before. I am trying to avoid having to remove mine. The other three are working great, the bike runs great at all RPMS, has great acceleration, but at idle the rich condition is evident by a strong fuel smell. However, I am still getting 32 MPG consistently. Here are the other signs and symptoms:

1. The bike set up for a few months, I've run 3 tanks of gas with seafoam. The carbs are synched. I've changed out the #3 plug, wire, and cap.

2. The vacuum advance works (I can hear it). A vacuum pump showed a leak. I put 5 in Hg on it and it bled off in 30 secs. After further investigation, there was wet fuel where the vacuum line attaches to the vacuum module. This may be my leak, not the diaphram itself. The gas there leads me to believe the vacuum port on the carb may be pressurized, not sucking. Have you ever seen this?:baffled: Could this somehow be related to the rich #3 carb condition?

3. The only other sign is the right tail pipe end is slightly gold and a wipe with the finger shows black soot.The left side does not have this.

It's looking more and more like the carbs will have to come off, but if that's the case, I am not touching the other 3, they work great. I appreciate any wisdom and words of experience.
 

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If I remember right #3 carb is the one with the accelarator pump. Your problem could be there. The carbs aren't that hard to get out of an 1100. :)

I am REALLY dreading removing the ones out of my 1200 though!:shock:
 

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The carbs on the 1200 are much the same to remove. The choke cable on both models is a bit fiddly, otherwise it's straightforward enough.
 

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Hi cardkev have just joined,

I have a 1100 interstate1981 with the exact same problems did you find out what it was before I strip the #3 carb down.

Ralphy
 

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I answered ralphy's post on another topic, but here it is again. If you have fuel in your vacuum line to the vacuum advance and the #3 is running rich, it's a leak in the bowl gasket or the bowl screws are loose. Try a bit of Permatex #2 or Silicon gasket seal. When you drop the bowl you'll see that the vacuum nipple goes into a chamber in the bowl that's isolated from the bowl with a loop of the gasket. The chamber is vented to the carb throat to provide the vacuum to operate the advance. If there's a leak here it will pull excess fuel from the bowl into the #3 carb throat.
 
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