Piston ring set 594437 and complete engine gasket set 796187 for the Briggs & Stratton 31-series Intek single-cylinder OHV engines, 16 to 18 HP, at the 90.5mm (3.563 inch) bore. Pistons, connecting rods and valves are not included. The kit fits model numbers beginning 31, including 319775, 31A507, 31A607, 31A677, 31A707, 31A777, 31A807, 31C707, 31C777, 31D577, 31E577, 31E607, 31E677, 31E707, 31E777, 31E877, 31G707, 31G777, 31L777, 31N607, 31N677, 31N707, 31N777, 31P607, 31P677, 31P707, 31P777, 31Q505, 31Q607, 31Q677, 31Q777, 31R507, 31R577, 31R607, 31R677, 31R707, 31R777, 31R807, 31R877, 31R975, 31R976, 31R977, 31S777, 31S977 and 31U977, and the 592054, 592059 and 592060 short blocks. Ring set 594437 replaced the earlier 699026, 697164, 699051, 791936 and 792506; gasket set 796187 replaced 794150, 792621 and 697191. These are standard rings, so measure the bore before ordering, then check the head for warp and the valves for seating, hone lightly, stagger the ring gaps and follow the service manual for head bolt torque.
- RING SET AND THE COMPLETE GASKET SET - Piston ring set 594437 and engine gasket set 796187, with the head, valve cover, intake and exhaust gaskets. Pistons, connecting rods and valves are not included.
- FITS BRIGGS & STRATTON 31-SERIES INTEK SINGLES - The 16, 17, 17.5 and 18 HP single-cylinder OHV engines at the 90.5mm (3.563 inch) bore, model numbers beginning 31, such as 31A507, 31A707, 31C707, 31E777, 31N777, 31P777, 31R777 and 319775.
- REPLACES 594437 AND 796187 - 594437 replaced the earlier ring sets 699026, 697164, 699051, 791936 and 792506, and 796187 replaced gasket sets 794150, 792621 and 697191. If your parts list shows any of these, this kit covers it.
- STANDARD BORE ONLY - Measure the bore for size and taper before ordering. An engine bored oversize needs oversize rings.
- WHILE IT IS APART - Check the head for warp and the valves for seating, hone the bore lightly, stagger the ring end gaps and tighten the head bolts in the sequence in the service manual.