Restore proper compression and sealing with Namura NA-40011-2R piston rings, designed specifically for 84.95 mm Namura pistons used in select Yamaha applications. This replacement ring set helps support efficient combustion, consistent engine performance, and reliable oil control when rebuilding or servicing a compatible engine.
Manufactured by Namura and identified by manufacturer part number NA-40011-2R, these rings are intended for use with Namura pistons rather than as a universal replacement. Confirm the piston size, engine model, and existing piston specifications before installation to ensure proper fitment. The vendor part number is 186-40112R.
For best results, inspect the piston, cylinder, ring grooves, and cylinder wall condition before assembly. Follow the applicable Yamaha service procedures for ring orientation, end-gap inspection, and break-in. Proper installation helps maintain compression and supports dependable long-term engine operation.
Features:
- Size: 84.95 mm piston ring set
- Model: NA-40011-2R
- Brand: Namura
- Manufacturer Part Number: NA-40011-2R
- Vendor Part Number: 186-40112R
- Fitment: Designed for use with compatible Namura pistons in select Yamaha applications
- Application: Replacement piston rings for engine rebuilding and service
- Installation: Verify piston, cylinder, ring groove, and end-gap specifications before assembly