My 750SS (carbie) has a Ducati one on the pipe leading from the little expansion hump at the front of the tank. I copied the hump for my tank and thought about buying a Ducati one for the M900 but lost interest when I saw the price, I never really questioned its function before but I do think you have a point Mr Gazza. I know similar devices are mandated on rally cars but that is to stop the petrol flooding out when the car lands on its roof. If I fit it I think I will still need a breather hole in the tank filler cap (or thereabouts ) otherwise I will get fuel starvation of the float bowls. Puzzling?????
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