Briggs & Stratton 121609-0288 6.75 HP Briggs & Stratton 121609-0288 6.75 HP Has automatic Touch-N-Mow starter -automatic recoil 7/8" dia. x 3-5/32" keyed crankshaft Drilled & Tapped 3/8-24 Has 2 woodruff key slots Shipping weight = 30 lbs