Sierra 18-3915 Marine Piston Rings for Johnson/Evinrude Outboards

The Sierra 18-3915 piston ring is a high-quality replacement component designed specifically for Johnson and Evinrude outboard motors. This ring is engineered for engines with a 3.187 inch standard bore size or 3.217 inch oversized bore (0.030" oversize), making it compatible with a wide range of horsepower applications.

Key Features:

• Designed to meet OEM specifications for reliable performance
• Fits various Johnson/Evinrude models including 25-35 HP 2-cylinder, 35-60 HP, and 65-75 HP 3-cylinder engines from 1983-1995
• Premium construction ensures proper compression and oil control
• Precision-machined for optimal fit and sealing performance
• Built to withstand the harsh marine environment

Sierra marine parts are engineered to meet the demands of today's high-performance outboard engines and are manufactured to match or exceed original equipment quality. This piston ring is sold individually and can be used for engine rebuilds or repairs. OEM equivalent part number 317831.