Sierra’s 18-4081 Piston Kit is designed for use with Yamaha outboard engines. It includes a Standard Starboard Piston and Sierra’s 18-39320 Piston Rings. All pistons come with piston rings and a wrist pin. The kit is interchangeable with Mallory 9-53831 and Yamaha Outboard 6R5-11631-10-93 and 6R5-11631-11-93. Each Sierra product meets or exceeds the original equipment part it replaces. Fit specific, check part numbers to ensure proper fit.
Designed for use with Yamaha outboard engines
Includes a Standard Starboard Piston and Sierra’s 18-39320 Piston Rings
All pistons come with piston rings and a wrist pin
Interchangeable with Mallory 9-53831 and Yamaha Outboard 6R5-11631-10-93 and 6R5-11631-11-93
Fit specific, check part numbers to ensure proper fit
