There is always the food colouring and water trick.
Add food colouring to water.
Mix water with petrol at about 10:1 and shake.
Leave overnight.
Syphon off the coloured bit that is now water, food colouring and ethanol.
Not such a hassle to produce a couple of gallons for storing your Brough Superior over the winter, but I couldn't be bothered for every day use.
Andy
Gentlemen i think that i will follow the recommendation of the dealer although i am not convised of the outcome and that the most of you suggest and it seems logical to do. I bought this bike new for not to have any kind of trouble and you understand that this was kind of dissapointment for me. Except this the bike runs great and it suits my needs perfectly for a daily commuter and a Sunday ride at the beach with my wife, you know Greece in summer time has great places to go and get wet !! So today a big YES i would have bought it again if i had to make a choice for a new bike. As said above t