We are all ears Dan, any advice you can give will be much appreciated, I don't believe it is a carby problem because we can completely control the revs up and down through the rev range by sucking and blowing through the governor tube which proves the diaphragm is working ok and lifting and lowering the poppet. I was listening to a neighbour across the road mowing his lawn with one and it was revving its heart out and I wasn't going over to offer him any advice because I have none in this case. They obviously work ok or they don't