Yeh i thought it may have been something to do with the moisture in the air diluting the mix in the combustion chamber when the humidity was up,or something like that.But i thought i would ask the question and get some ideas from around the globe. thanks for the ideas fella's, this hobby is more complex than it seems.My poor brain has to get used to accepting information again not easy when its trying to get used to hand eye co-ordination again as well.""Hey Downunder i agree""nearly perfect all year.