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Ive got a set of 38 mikuni smoothbores and the bowls have fine little cracks in each of them. They were never dropped.I have a little gas on the bottom of one of the bowls so i pulled the carbs off.I checked the rubber gasket and that looked good. Could it be leaking out of them really fine cracks?
Thanks Keith
 

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I doubt that they go all the way through. Mine have cracks also, it just seems to be the way the metal is. If your really concerned put some gas in and see if they leak.
 

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The cracks are most likely just casting marks. Almost all the carb bowls I've seen have these in them. If the bowl does continue to leak and you can't figure it out, there is a white powder spray one can get to help you detect where the leak is coming from. I beleive Wurth makes such a can.
 
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