This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1975 Honda CB550F Super Sport was acquired by the selling dealer in 2019, reportedly from a vintage automobile restorer who was its second owner. Power is from a 544cc SOHC inline-four paired with a five-speed manual transmission, and the bike is is equipped with pod air filters, a MAC four-into-one exhaust system with a Kerker muffler, a Lockhart oil cooler, stainless steel brake lines, a drilled front brake rotor, and bullhorn handlebars. The top end was serviced with valve work and a new head gasket under previous ownership, while the selling dealer has fitted new tires and synchronized the carburetors as well as checking valve clearances and ignition timing. This CB550F Super Sport is offered at no reserve in Wisconsin with a stock airbox, an owner’s manual, a tool kit, two keys, and a clean Iowa title.
The fuel tank is finished in Candy Sapphire Blue, and the seller notes blemishes at the right rear that can be viewed in the gallery below. The bike is equipped with chrome fenders, side covers, fork legs, and headlight ears. A replica seat cover was added under previous ownership. Chrome wire-spoke wheels wear 100/90-19 Shinko rubber up front and a 110/90-18 Kenda tire at the rear, both of which were installed by the selling dealer in preparation for the sale.
Bullhorn handlebars with replacement grips carry a single bar-end mirror on the left. The brakes are said to have been rebuilt by the previous owner and feature stainless braided lines and a drilled front rotor. A replacement LED headlight and a slim tail/brake light accompany the factory-style amber turn signals. Just over 31k miles are reportedly shown on the five-digit odometer.
The 544cc SOHC inline-four breathes through re-jetted individual Keihin carburetors with pod filters and a MAC four-into-one exhaust system with a Kerker muffler. A Lockhart cooler fitted to the downtubes draws oil from an adapter at the base of the filter housing. A top end rebuild under previous ownership is said to have included lapping and decarbonizing the valves, replacing the head gasket, and repainting components using an enamel finish. Carburetor synchronization was carried out by the selling dealer along with ignition timing and valve clearance checks. Power is sent to the rear wheel through a five-speed manual transmission and a chain drive.
The stock airbox, an owner’s manual, a tool kit, and two keys accompany the bike. A walk-around and start-up video is provided below.