Whatever fuel stabiliser you decide on, ensure the fuel tank is topped right up to the brim with Fuel as this stops condensation forming in the space above the fuel level line, which in turn causes rusting in a metal fuel tank, start the bike and allow it to run for a short while (few minutes) after adding the stabiliser, ensures stabilised fuel is right around the system.A friend runs a landscape business, he has equipment that stands for about 5 months per year unused, Mowers, Strimers, Hedge cutters etc, he uses a fuel additive by Briggs and Stratton Dan's advise is do not drain the fuel tanks but add stabiliser and run for a minute or two, also if the machine has a fuel cock/tap leave it open, fuel can evaporate and leave the carb empty (with the fuel cock shut) causing gasket, O-ring and carbdiaphragm failure and also dried fuel deposits in the bowl and capillaries.With Dan's advice in mind I also use Sta-bil and thus far have had no issues with my carbs after the winter stand down.There is another additive that I have used since reading 'Darrsi's' recommendation on here and that is 'Marvel Mystery Oil' I use it every other fill up, as I never run my tank much passed 1/4 full, so here is always Marvel in the fuel.Now some have said its all 'Snake Oil' and does nothing, apart from making your wallet a little lighter, but I really believe my FZS600 is more responsive and it certainly starts first stab of the button, if that is all in my mind then so be it, but it certainly acts as a Upper Cylinder Lubricant (UCL) and helps make up for the lack of lead in modern fuels.The Marvel bottle says you can also add it to your engine oil as an enhancement, I personally would not recommend this as it could play havoc with a wet clutch system.The other additive that I use is a fuel system cleaner STP Complete Fuel System Cleaner, I put 100ml of it in a full tank every 10 or 12 weeks (twice a riding season) again does it help ? Don't know for sure, but I have had the Fazer FZS600 for 6 years and have never touched the carbs, I bought a balancing gauge set as I was told that it was an essential, it has been out of the box once just to see what it looks like. EDIT:I just looked at the photos again, I do not recommend Jack Daniels if you are having anything to do with the bike in the next 8 hours or so.