I tried several different solutions to reduce the belt noise. I took it to Berrybrook and they tightened it up, but it still squeaked. I then found on a US forum on belt driven Motorbikes and it suggested using very thick grease. I tried a few different ones which all cured it for a limited time (100 miles or so). I finally used a very thick Molybdenum grease (DX3) I smeared it liberally over the Belt teeth. I have now done 700 miles and it has just started to squeak a little, so I may have to put some more on, but I am happy with this.
