Rough Running.... Need Help

[Dead Eye]

Probably about 2 times the capacity of the float bowls? Trying to think of a sensible measuring technique I have some of the glass bowls that you get from GU deserts - they are fantastic for things like this and holding little parts

But, being a little more useful - id say less than 1/4 of a standard 200-250ml (1/2 pint~ in old money) glass? That should be more than enough to drain the bowls but it won't necessarily help if you have a lot of water in the fuel tank.

I agree with red98 though - this sounds more electrical to me and that you are running on 2 / 3 cylinders. That accounts for the loss of power, sounding like a Harley and the small backfires as fuel isn't being ignited in 1 or more of the cylinders