My research shows that a consumer gets a 5 year warranty and a commercial user gets a 2 year warranty on any Echo equipment they buy. Could you consider getting some warranty service on this unit since it is still under coverage? It sounds like a fuel delivery problem (carburetor adjustment maybe), but I also realize that some of the newer "rotary" type carburetors in use don't have the Low and High speed mixture adjusting screws like the old-style diaphragm carburetors that preceded them.