Chrissy, I dont think its an exhaust hole as its just happened since it was adjusted, it popped a bit before but they are proper bangs now!. Its most of the rev range when the throttle is shut.

Im glad its extra fuel as least (hopefully) that means that the pinking is not due to it being lean. Its DRINKING fuel now....

So what about the pinking?, too much ign advance?. Im going to buy a timing light tonight and see what its set to..