[Stephen barthelmass]

You drill it and open it more. If I had to guess its to get more flow without having to worry about it vibrating out. Also no matter how far you open a valve if the initial port is too small it will just lean out.

Ive done this to 2 carbs  and the before and after is extremely noticeable.

[Brett Staples]

Hi All

I have tried to open link but wont work, would someone be able to make this happen

Thanks Brett

[Walt Gifford]

Drilling that hole ensures enough fuel feeds the low needle before metering. Of course you have to pull the welsh plug to clean up because chips go everywhere.

Gif

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