Hi Bruce, All the gaskets and the white spacer plate are all new genuine spares and I will try a new fuel filter on it before I try the jet drilling, It was from what I had been told from 3 different guys from mower shops that due to these originaly being designed for colder climates they like just a bit more fuel at the top end of the rev range, I was curious to know if anybody out there had tried this and it was worth the trouble? Thank you for your reply, any help is appreciated