To replace a Kohler CV740-0028 with a 1-1/8" x 4" shaft, we offer the exact engine below. Also, you could use any of the Command Twin engines listed below, but may have to reuse parts from your old engine. To replace a Honda GXV670, you can use any of the Repower Conversion Kits listed below (Hust-SuperZ), but will need to measure your shaft size first.