The rings are standard size and precision-engineered for a cylinder bore with a 2-7/8 inch diameter. With a full set of 12 pieces, you will have plenty of material to outfit the pistons of your engine block with fresh rings. Replacing worn rings is essential for restoring optimal engine compression and ensuring an efficient combustion cycle.

This specific type of piston ring was utilized by Kiekhaefer and Mercury in various iconic 2-stroke outboard models. The set is specifically designed for the Mercury 350 // Mercury 650 // Mercury 850 // Mercury 900 // Mercury 950 // Mercury 1000. Within this lineup, the 350 is a 2 cylinder, the 650 is a 4 cylinder, and the 850, 900, 950, and 1000 are legendary inline 6 outboard motors. Please verify your engine serial number and bore size prior to purchasing to ensure a perfect fit.