Homelite Push Type Weed Trimmer - (Unadilla, GA. in Macon, GA

I have a Homelite push type weed trimmer. It has a 160cc 4 stroke engine. I bought the machine brand new from Home Depot in late summer/early fall 2009. I only used this machine on two occassions for about 20 minutes each time. The very first time I used the machine it seemed to me like it needed to be idled up higher. I used it those two times the