I bought this bike as another project from a so-called bike shop That was closing down. Owner said that he had been through the carbs, but when I fitted to the bike, they were leaking like a sieve. I have since cleaned and rebuilt them, but I am struggling with one thing: there seems to be a flexible fuel line connecting the carbs, going from one nipple to the other, but it is obviously not the primary supply line (brass tube) and I cant see the same tube in any online photos. It almost looks like overflow ports and I am wondering if the prior owner had them connected together because it was gummed up and leaking so badly. I have attached a few photos and am looking for some feed back from the group, since the manual hasvery little information on the Carbs. Appreciate any and all assistance.