Mikuni float bowl passages

[mikestp]

Same with all the ones I do WITHOUT a drill...apples and oranges. And the only thing that "meters" it is the tiny hole in the end of the brass tube. There are 4 bigger holes at the top right where the tube goes into the carb body..those dump the excess fuel back into the bowls. And they allow a little air to be mixed as they are sipping fuel initially.

I just don't have the time to hand clean all the parts of the carbs I do. I soak em overnight and drill the next day, soda blast, and that evening I am able to deliver the bike to the customer. You might have a week to do a small task. Whereas I normally have a day.

 

[Steve]

The passage is not a jet. It is not acting as a meter. It is simply a hole drilled to allow gasoline from the bottom of the float bowl to get to the brass pickup. That brass pickup IS metered.

That depends on the bike. :-k

I have not noticed any particular trends related to model or year, but I have seen some carbs that had tiny holes at the bottom of the bowl passage, others have been wide open. I have seen some carbs with open "choke" pickup tubes, others have had a small hole at the tip.

It does not matter much which one has the metered hole, or even if both of them are metered, as long as both of them are not wide open.

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