Hi Mike, Our latest Breather mod works a treat and is fitted to a ET24 Valve Cap. We fit this assy to the front Inlet Pushrod insp. position. There the pressure from the Crankcase has an easy path up the Pushrod tube from the Timing chest. We fit an outlet pipe from the Valve that is 20mm I/D and the Valve it's self is over 15mm. The actual Reed Valves, of which there are 2, are well in excess of this. The moulded pipe that we supply has a tight bend in it which fits neatly under the Tank and runs back to just behind the Battery. It can be extended down to behind the Kickstart Cover if required. We are just waiting for some new Pipes to arrive when the Kit will be available. The Valve fitted to an Inspection Cap and the Pipe is bp 95 plus carriage (and EEC vat where applicable - not USA) If you wish to order one, please supply your address and Visa details. We recommend sending Visa details in 2 separate e-mails for security. Regards Colin & Annie Jenner