I converted a Ryobi 31 cc and it was relative easy to convert plus the extra parts weren't very expensive. I got a new, reconditioned weed eater from Harbor Freight for $49.95 with free shipping. Removing the Ryobi was quite simple. They have them too in their stores for I believe $59.95. It ran well with the magneto but I converted it to a home built PIC controlled CDI ignition. Saved one pound in weight.