Restore proper engine performance with Namura piston rings, part number NA-40005-4R. Designed specifically for Namura pistons, this 83.95mm ring set supports reliable compression, efficient combustion, and dependable oil control in compatible Yamaha BW350 applications. The rings are intended for use with the specified Namura piston and should be installed according to the piston manufacturer’s recommendations.
These Namura piston rings fit 1987 and 1988 Yamaha BW350 models when paired with the correct Namura piston application. Confirm piston compatibility, ring groove specifications, and cylinder condition before installation. Proper ring orientation, end-gap inspection, and cylinder preparation are essential for achieving the intended seal and service life.
Manufacturer part number NA-40005-4R identifies this product, while vendor part number 186-40054R may be used for ordering and reference. This replacement ring set is a practical choice for engine rebuilding, maintenance, or replacing worn rings on a compatible Namura piston-equipped Yamaha BW350.
Features:
- Size: 83.95mm piston ring set
- Model fitment: 1987-1988 Yamaha BW350
- Brand: Namura
- Manufacturer part number: NA-40005-4R
- Vendor part number: 186-40054R
- Application: For Namura pistons only
- Function: Supports compression sealing, combustion efficiency, and oil control
Fitment:
1987 Yamaha Bw350
1988 Yamaha Bw350