51mm Cylinder Piston Pin Ring Kits For Husvarna K750 K760 K770 Cutoff Saw This piston ring kit is designed for use with 51mm cylinder engines in Husvarna K750, K760, and K770 cutoff saws.It includes a complete set of piston rings and a piston pin, providing all necessary components for engine rebuilds or replacements.The rings are engineered to ensure proper compression and oil control within the cylinder bore.machined to match specifications, the kit supports engine performance and durability under demanding operating conditions.Suitable for use in professional-grade cutting requiring regular maintenance and part replacement.