I have three K.61s too. They are made by Mecoa and it is called the RJL K.61 http://www.mecoa.com/rjl/k61/k61.htm I like them because the have a small case and fit well in the classics. Pretty descent power at 1.8 HP. Most amazing is that Sheldons sell them for $120. They also sell HP engines http://www.mecoa.com/hp/61/2203.htm