Piston Ring Set Single Cylinder 86.50mm Bore

The Piston Ring Set Single Cylinder 86.50mm Bore by WISECO is engineered for precision engine rebuilds and high-performance applications where OEM or performance-grade ring sets are critical. Whether you're restoring a vintage powerplant, servicing a rebuilt engine block, or maintaining small-displacement single-cylinder equipment, this ring set delivers the sealing integrity and durability operators and mechanics demand in the field. Designed as a drop-in replacement, it eliminates guesswork during installation and ensures compliance with original equipment specifications.

This piston ring set features a 1.0 x 1.2 x 2.8 mm cross-section with standard tension design, machined from steel and treated with gas nitriding for enhanced wear resistance and durability under sustained combustion cycles. The nitriding process hardens the ring surface, reducing friction and extending service life—critical factors in engines subjected to demanding duty cycles. At 86.50mm bore diameter, the set is sized to restore proper ring-to-wall contact and combustion chamber sealing, ensuring optimal compression, blow-by control, and oil consumption rates that meet factory specifications.

Mechanics, equipment technicians, and powersports enthusiasts working on single-cylinder engines—from vintage motorcycles and ATVs to generator and small-engine applications—benefit from WISECO's reputation for precision engineering and material science. Installation requires proper honing of the cylinder bore to specification and careful ring end-gap measurement before assembly; following manufacturer guidelines ensures seal integrity and prevents ring breakage or excessive blow-by. This single-cylinder ring set is sold as an individual unit and should be paired with compatible pistons and cylinder preparation to achieve optimal performance.