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Discussion Starter · #1 ·
Hello,
I'm looking for some information that I cannot find, maybe some of you gurus will know.
I have a set of carbs that I'm doing a rebuild, on two of the carbs, one on the right bank and one on the left the air fuel mixture ports have ben cross drilled from the factory. This is right below the throttle body were they connect to the manifolds. On these two carbs the cross drilled portion is open with no plug. The other side has a factory plug pressed in. (Needle side)
Is this supposed to be open or is it supposed to be plugged?
Any info will be of great help.

Ralph
 

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I'm unclear what you are refferring to but, if it is the mixture screws, you need to remove the plugs to get those needles out so you can replace the o-rings and such, then adjust the carbs once back on the bike.
All that is explained in the service manual.
 

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A picture is worth a whole bunch of words. The mixture screws in a 1200 are on the side of each carb, not on the bottom.
 

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Discussion Starter · #4 ·
I will have to get a photo posted, at work right now.
What I am speaking of is the factory port drill plugs, not the emission caps on the outside covering the adjustment screw. They are under the butterfly on the outside. Two of the carbs are cross drilled the other two are not.
I'll post a photo tomorrow.
 

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I just went and looked at a set of 85 carbs I have, 3 of them have a hole on the side opposite the adjustment but it is not drilled through, the other 1 has a vacuum port.
 

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Discussion Starter · #7 ·
As you can see the needle side is plugged, the opposite side is open. When looking in you can see that it is drilled into the low speed port where it enters the throttle body.
 

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As you can see the needle side is plugged, the opposite side is open. When looking in you can see that it is drilled into the low speed port where it enters the throttle body.
The picture looks like it has brass plugs.

With the mixture screw out are you saying you can see right through the carb to the other side? If so that aint right.
 

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That hole goes nowhere, that is why it is not plugged.
 
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