Wiseco 90.5mm 1.0x2.0mm Ring Set Ring Shelf Stock

This is a Wiseco 90.5mm piston ring set, part number 9050YD. These rings are specifically made to work with Wiseco pistons, ensuring they provide the best possible seal and performance. Piston rings are critical for a few reasons: they seal the combustion chamber to maintain compression, they help control oil by scraping excess oil off the cylinder walls, and they help transfer heat from the piston to the cylinder wall. Wiseco develops and tests these rings for race-ready performance, meaning they're built to handle demanding conditions and provide reliable operation.

This particular set is designed for a 90.50 mm bore. The top ring is 1.00 mm, the second ring is 1.20 mm, and the oil ring is 1.92 mm. These dimensions are important for proper fitment and function within the piston groove and cylinder bore. Because they are made to Wiseco's specifications, you can expect them to work well with their wide variety of 4-stroke pistons, offering improved compression and sealing.

Please note that this ring set is not CARB approved and cannot be shipped to California. Always refer to the manufacturer's instructions for proper installation and compatibility with your specific engine build.