Had loads of old bikes in here with messed up carbs and fuel tanks.
The latest info is that we are seeing more ethonol being used in pump fuels, currently up to 5%. new legislation will allow up to 10% in the near future.
This means any rubber parts can deteriote quickly, and ethonol also attracts water so encourages corrosion of fuel tanks.
So, Ive been looking at what we can do, and I,ve found this relatively cheap additive which will keep your fuel fresh and also help prevent deteriotion of the fuel system and keep corrosion at bay.
I would suggest if leaving bike for over a month then add some of this to your fuel and run through engine before stashing bike away.