I convert my own Homelites. I use 25cc from a weedwacker or a 33cc from a 16 in. chainsaw. U can get all the parts from Carr Precision engineering. He has everything you need. If you go into cummins tool. com you can get a 25cc homie weedwacker from them for $49. Or you can get one from Harbor Freight for $79. Another sight is B & B Specialties.