fuel leak from top of bowl

The carb bowl gaskets are new from a K&L repair kit bought off Ebay.  I am seeing seepage from at least 2 of the carbs right where the bowl meets the top.  It does appear to be coming from the left side of the bowls as you face forward.  With the bike on the kick stand the gas would probably be fuller on that side.   Any idea why these would be leaking?  I have no fuel going through the overflow tubes so the floats and seats seem to be doing their job.  The seat and needle were also replaced.

 

While I've never personally seen it, some members report warpage of either the carb body or the bowl.  

How thick are those bowl gaskets?  Some are thicker than others.  

It's a common occurrence on older carb bodies unfortunately, i see it all the time. What's actually happening is fuel is weeping out around the centerline to venturi mating bowl to carb casting surfaces. Over time the carb casting "bows", outer sides where the (4) screws tighten pull the casting material down. Because flat surfaces of casting and bowl can't compress a flat gasket and the only clamping is on the outer edges bowing begins. I've seen persons think it's the bowl that is warped but that's Never the case, always the carb casting. And person's rarely address this common issue because when setting float/fuel levels on the "bench" you won't see the weeping till carbs are exposed to the Real World of fuel sloshing when riding or as you have found, on the side stand where fuel is present at the mating surfaces. Unorthodox i know but i oring the bowls. It's a tricky ordeal but it works. Nessism  Loves the concept too, NOT ha but i've been doing it for over 15yrs on all sorts of engines without a single failure. Example shown, not your type bowl but theory/application  remains the same 

The shape and precision of that o-ring is pretty amazing.  How does one even attempt to make this and keep the shape that's needed?

LTDflyer1000 wrote:

The shape and precision of that o-ring is pretty amazing.  How does one even attempt to make this and keep the shape that's needed?

Superglue.