| Tim I think the Monnies breath through the fuel filler cap where as the SS models and the subject of the previous post have a pipe coming out of the bulge at the front of the tank and come fitted with a non return valve which in turn goes to a pipe that feeds through the centre of the headstock and exits below the engine. With out the valve petrol would exit the tank via the pipe every time you braked hard with a decent fuel load.
As such us SS runners have to have a one-way valve that in the event of failure has to go to a catch bottle. |