Hi,
Are they 6mm or 8mm? Mine are about 300 longer than they need to be to reach the keg, but four metres is a bloody long line. Think of all the beer you'll waste! If you are single fermenting and then doing a force carb I don't really see a problem with the line length, heck, even if you're keg conditioning I can't see why you can't just manipulate your push gas. Maybe that's for people that don't intend to use and force at all and just go from a secondary ferment keg?
Don't know. But mine are no where near 4m, try 1.5 tops. I have had head issues, but they are explained by other factors (too much sugar in secondary).
Cheers,
Nik
Shit umm well they look to be about 8mm if my memory serves correct (will verify when I get my next beer) the guy I got the set-up from has his trimmed right down and told me that you can do it.. I should trust him hey!
I would seriously love to watch you make beer the proper way hey...