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1999 Shadow 750 ACE VT750CD3 Modified
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Go here to get the Service Manual:
Look at the General Information - Wire and Hose Routing and also the Fuel System section.
California versions have different routing and gismos so check them out if it started out as a California spec. bike or got the carbs from one.
49 state bikes have the bowl vents run to a T and a hose that just hangs down to open air and AFAIK no open ports by the mixture screw, are they drilled through or blank inside.
 

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1999 Shadow 750 ACE VT750CD3 Modified
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4,659 Posts
Manifold vacuum port
Vacuum sources for California emissions evap diaphragm valves , I see photos of the carb body in the Service manual both with and without that hose fitting.
IIRC that is the same place the air-cut valve gets vacuum in the carb body.
If it isn't a California emissions bike I'd just cap the fittings and call it good.
 

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1999 Shadow 750 ACE VT750CD3 Modified
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4,659 Posts
I'd cap them, a hose between the two would work as a vacuum balance pipe, which may or may not really matter, it is a good question.
 
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