I know Duncan isn't a cool "boutique" builder or shop. Personally, I got a used Duncan Paul Turner Eliminator Top End for my 250R that I wanted to bring back to life. I called Duncan and spoke with Loren. They were super nice and helpful. I got my cylinder back in a couple of weeks and everything went together great. I called back and got some jetting advice from them. Good people that still love 2 strokes!