Thank you all for your help I just have one more dumb question if my mix is too lean do I turn the screw to the right/left? I was trying to sort it out this morning adjusting the screw a few clicks in both directions but did not notice any difrence in sound, what should I be listening for, the engine is not new and not running hot the previous owner has flown it about 5 times and it is 6 months old surely it should have some life in it still, hope you can help