carb breather

Hi,
does anyone know if the breather that comes from the carb (not the choke throttle side) other side big plastic thingy that has a short pipe and a long pipe that goes under the carb does anything ?
Was thinking of replacing it with this... direct to the bit of pipe..
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... otohosting
Jak
does anyone know if the breather that comes from the carb (not the choke throttle side) other side big plastic thingy that has a short pipe and a long pipe that goes under the carb does anything ?
Was thinking of replacing it with this... direct to the bit of pipe..
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... otohosting
Jak