please help I resantly bought a Dellorto type carby for my 48cc chinese motor and it wont hit full reves it just 4strokes it runs good at low speed it has a mixter screw I thought it was running to rich I have leaned it out as far as I can until it wont run then wond it in till it runs ok down low but it keeps 4stroking flat out and its hard to start cold as it doesnt have a choke PLEASE can some one out there help ps it ran perfect with the stand carby mike29