Registered Forum User
Ducati Corse
Posts: 3,134
Join Date: Jan 2002
Location: notts
Mood: Bloo and Yellow.. and Red now ;)
It's a vent tank for the carbs. Bit like the breather on the engine. Lets any vapour build up escape.
Try taping the split to see if the idle settles. Doubtful though, unless the breather is affecting the air bypass.........