Hi John, I think it all depends on who supplies the new Amal carbs. Items from Burlen Fuel Systems which are of the type as fitted when the machines were new, are made in the UK to exacting standards, the Mk1 and Mk11's were made in Spain, but production is now being implemented in the UK. The costings are horrendous, so Burlen are re-jigging old tooling. All jets and the like are reamed to size and are not drilled like some of the other Amals on the market. The actual flow rate of the other Amals can vary by two or three sizes. New models of Mk1 and Mk11 will not be available until much later this year. All Amal products are proof against E10 fuel. Talking of which, after two months, the ethanol separates from the other chemicals and sinks to the bottom of your tank along with the water which is drawn into the tank by the hygroscopic action of the ethanol, so when you start your beloved Vin up, firstly it will spiot and fart about and when it finally lights up, you will be drawing pure ethanol through the rubber fuel pipes which will be gradually eaten away. So, if you do not ride often, DRAIN THE TANK, and perhaps it is an idea to shake the thing before a ride.
Ethanol attacks zinc and galvanised steel, brass, copper, lead/tin coated steel, some alloys, neoprene urathane rubber, bura-n-seals, polyeurothene, some polymers, nylon66, fibreglass reinforced polyester, some epoxy resins, shellac and cork. Pretty desperate stuff. When handling it, wear gloves and do not breathe in the fumes. And on that note, I'm off. ET43