Please confirm that your old engine has the same crankshaft size: 1-1/8″ Diameter x 4.29″ Length. Briggs and Stratton vertical engine. 20 Gross HP at 3600rpm per SAE J1940. OVERHEAD VALVE DESIGN O. Cast Iron Cylinder Sleeve. 12V HD Electric Start. X 4.29 dynamically balanced keyed Crankshaft. Crankshaft drilled/tapped 7/16-20 crankshaft, ready for bolt. Not for sale to California. Consumer or Residential use. Commercial or Rental use. These numbers can be found on a plate of your engine. We have a lot of engines available. Have not heard from us. If the 24 hour period has passed and you have not heard anything from us, PLEASE try one more time. There might be some problems preventing your message from getting to us. Please leave us a message if the line is busy or nobody answers. It is also easier for us to contact you if there is any problem, providing we have all the correct information. VERY IMPORTANT: Engine(s) may or may not be filled with oil. PLEASE check your engine oil level and add oil as needed before using. We will not do it. Please look at the return condition we set on the top of this page. Please remember, if you send a request to look for an engine, it is our courtesy and pleasure to research on your engine’s fitness and specification for you. We use our best knowledge and experiences to answer all your questions. However, we are not responsible for your engine’s fitness, functionality or merchantability. It is customer’s job to assure that the engine ordered will work and fit for their specific application. WARNING: WORKING WITH ENGINES or POWER TOOLS SUCH AS SAWS, GRINDERS, DRILLS, CHAIN SAWS, AND THE LIKE, PRODUCE A POTENTIAL RISK TO THE USER. CARE AND CAUTION AT ALL TIMES SHOULD BE EXERCISED BY THE USER TO AVOID POSSIBLE LOSS OF PROPERTY OR PERSONAL INJURY OR DEATH.