Since MTD absorbed most of the lawn equipment companies, most of their chain saws are Poulan based. Weed Eater was a Poulan product. The basic Homelite engine is still part of the product line and is used on the Ryobi 30cc and has been upgraded. McCulloch is using a combination of engines depending on the end use. Engines I have observed are from China, Tiawan, and USA. Many of the machines are assembled in Mexico. Engines I have dismantled appear to be of good but not industrial quality. I presume the 31 and 32cc machines being sold at give-away prices are new/old stock that are coming out of the warehouses. MTD is apparently disposing of superceeded machines to make way for next year's models. From what I have observed, I assume most of these will be coming from China. There is still Stihl, Kioritz, Makita, and Zenoah!