Is this normal???

[Si2500]

Hi All
This is a pic of the top of the float bowl above the floats in my VM26s on my 78 GS750.
This is the carb for cylinder 3...
My question is why is one of the holes blocked on this carb and none of the others in any of the other 3 carbs... As ringed in pic..
Is this a standard factory plug..
Bike is running and aftermarket fuel tank with non vacum petcock in case that makes a difference!

[zed1015]

Carb bodies are pretty much all the same casting ( usually handed in pairs either left or right ) with the passages drilled to suit their position on the rack .
Depending on position some are drilled and some left blank.
Some drillings are also dual purpose depending on the intersecting passages machined at the factory such as the brass breather tube on carbs 2 and 4 which would be employed as a vac port if located on number 3 carb.
On your carb the drilling shown would the a bowl vent if located in another position.
There should be another hole in the roof of the bowl chamber on the opposite side to that one which is just out of shot in your pic..

[Si2500]

Hiya
Cheers for the reply.... There is another bowl vent on the opposite side of that carb...
I fitted the restrictors btw and they worked great
( it has since stopped working AGAIN! hence the question above!!)