Shindaiwa T-27, 27cc's and about 7 years old with a fully automatic head. Never been real crazy about the head, sometimes it feeds great, some times it doesn't. If the string welds together forget it, you have to take it apart. It's almost worn out so I need a replacement head. Also I took the angled gearbox apart and tapped the grease port for a std. grease fitting. Makes it easy to grease but you have to be careful not to over grease it. I've been more than satisfied with the trimmer, I use 92 octane and Husky 50 to 1 mix, cranks on the first pull virtually every time. Grateful