Hello matey mine is the same, i think mine is possibly running rich, it just seems to be now and then though, i noticed it happen bad yesterday as i was in second gear and just put my foot down a little bit and then backed off to come to a stop at some lights, it really smelled strong for a few seconds when i stopped. also my friend said the other day as i passed him giving it a little bit

it chucked a canny flame out the back

so i think it needs checking, must be doing something with the fuel the ammount the bloody thing drinks!