You must have used it a lot to wear out the cord,how many hours do you suppose?
I'm not sure, but it's a lot. I bought it in early 2008 when we started RVing and we camped (boondocking; dry camping) 9 days a month until Thanksgiving, 2011, when we moved here to AZ. In the summer it ran, using an extend range fuel tank, as much as 18 hours a day for the AC. Spring, Fall, and Winter, it was only used to run the micro/convect oven.
Still haven't changed the spark plug but do run Sea Foam through it occasionally.