This original Briggs & Stratton ring set (piston rings) is designed for the factory pistons of robust four-stroke engines with vertical and horizontal crankshaft output, rated 10 HP, 12 HP and 13 HP. The set contains all the necessary rings for one piston of standard cylinder bore (Bore: 87.31 mm) that provide maximum sealing of the combustion chamber, efficient heat transfer from the piston crown to the cylinder wall and precise control of oil consumption inside the crankcase. This factory set directly replaces the older (legacy) catalogue numbers 792308 and 797011. By choosing the original set you successfully restore factory compression, eliminate excessive oil consumption and bluish smoke from the exhaust, giving the engine stable operation and full power on demanding terrain. When fitting the new ring set, it is crucial to thoroughly clean the grooves on the piston of caked soot deposits, because any retained dirt can cause the ring to "stick" and compression to be lost again. During fitting, pay attention to the factory markings on the rings themselves (the "TOP" mark or dot always faces the piston crown/combustion chamber), and arrange the ring gaps at an angle of 120 degrees so the slots do not line up. Lightly oil the cylinder with clean engine oil before inserting the piston and use a dedicated ring compressor so the rings do not break during engine assembly. Key characteristics Part type: Piston ring set (standard ring set) Manufacturer: Briggs & Stratton Cylinder bore (Bore): 87.31 mm (3.437 inches) Pack contents: Ring set for one piston Catalogue number (OEM): 792306 (Replaces numbers: 792308, 797011) Compatible models Four-stroke petrol engines (vertical and horizontal): Briggs & Stratton engines of 10 HP, 12 HP and 13 HP used on riding lawn mowers and other garden and outdoor machinery.