Oregon's comprehensive Lawn Mower Engine Tune-Up Maintenance Kit offers reliable performance and all the parts needed for a season tune-up. Compatible with Honda HRX and HRR Series Engines, this premium kit provides long-term durability and efficiency. With Oregon's easy kit, you can get back to tending your lawn swiftly. Kit includes: Oregon Lawn Mower Engine Maintenance Kit, Air Filter (17211-Z8B-901, 17211-ZL8-003, 17211-ZL8-023) and Spark Plug (98079-55846). Oil and filters should be inspected and changed periodically; refer to your owner's manual for manufacturer maintenance recommendations. Oregon replacement parts meet or exceed your original equipment standards. Includes: Air Filter (5" L, 4-1/2" W, 1" H), Spark Plug, 1L 10W30 4-Cycle Oil, and 2.5oz Premium Fuel Stabilizer. Replacement Guide: H