Hi there Trigger , was this on your Ullapool run at the weekend in the wet ? .......my old RGV 250 used to overrun in the wet , something to do with water vapour getting in the fuel mixture and causing detonation in the engine making it ovverrun , I don't know if the same thing could happen on a 4 stroke , where's that American bloke , he'll know
Did you speak to Boxy (Mark) at Shirlaws or someone else ? if it was in the wet tell them , this may make a difference.
Good luck