Restore proper compression and sealing with Namura NA-40004R piston rings, designed specifically for compatible Namura pistons used in select Yamaha applications. This ring set is intended for 3.936-inch piston assemblies and provides a reliable replacement solution when worn, damaged, or fatigued rings are affecting engine performance.
Manufactured by Namura, these piston rings are engineered for use with Namura pistons only and should be matched to the correct piston, cylinder, and engine application before installation. Proper ring-to-groove fit, end-gap clearance, and cylinder condition are essential for dependable operation, efficient combustion, and long service life. Confirm the Yamaha model and piston application to ensure compatibility.
Feature: Designed for compatible Namura pistons only
Feature: Fits 3.936-inch piston applications
Feature: Intended for select Yamaha engine applications
Feature: Replacement piston ring set for restoring compression and oil control
Feature: Manufacturer part number: NA-40004R
Feature: Vendor part number: 186-4004R
Features:
- Designed for compatible Namura pistons only
- Fits 3.936-inch piston applications
- Intended for select Yamaha engine applications
- Replacement piston ring set for restoring compression and oil control
- Manufacturer part number: NA-40004R
- Vendor part number: 186-4004R