This is an OEM product available at our store for an excellent price, along with many other Briggs and Stratton 725EXi Series parts from our catalog. Robust 993 (61 cubic inch) Displacement Broad equipment application Increased Horsepower-to-Weight Ratio Contributes to engine efficiency, reduces compaction, and makes handling easier. model 28N702, type 1143-E1 However, the spark plug size may vary depending on the tool or vehicle. var date = ((now.getDate()<10) ? The engine model number can be found in one of five places, depending on your cover: Your email address will not be published. Some I find stamped on the head but others I find in on the housing I mentioned or on some really old models that somebody else tore apart and rebuilt with non B&S parts the number is gone. Briggs and Stratton engines.