Hi there
Thanks for the reply, the plug looks black and sooty but is not particularly wet, you can wipe the soot off with a cloth but it has ussualy wrecked the plug by then, im not sure if a poor spark at low revs would result in this, i think i shall replace the coil, having tested with a multimeter the resistance is way too high i think there is a break in the wire just hoping it cures it as im nearly at a loss with this problem having tryed every think i can think of with the carb.
Cheers Nick