This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1977 Honda CB750 K7 was modified in the style of a cafe racer under previous ownership and shown in California through the early 2000s before its acquisition by the seller two years ago. The bike is powered by a 736cc SOHC inline-four mated to a five-speed transmission and finished with a handmade metallic yellow fuel tank, a black frame, and polished accents. Additional modifications include clubman-style handlebars, a custom bump seat and oil tank, relocated electrics, a four-into-one exhaust system, and cone air filters. This CB750 is offered at no reserve with a clean California title in the seller’s name.
The hand-formed fuel tank features knee cut-outs and is finished in metallic yellow, while the polished seat cowl was reportedly built from the body of a 1950s vacuum cleaner and houses a hand-blown glass taillight. The spherical oil tank is said to have been cut down from a repurposed industrial cylinder.
Black rims with aluminum spokes wear 100/90-19 front and 130/90-17 rear Bridgestone Spitfire tires that are said to be in need of replacement. The license plate is displayed on a bracket on the left side of the swingarm.
The bike is equipped with Clubman-style handlebars, and features stock hand controls as well as a centrally-mounted 150-mph speedometer showing 73k miles on its five-digit odometer. The ignition switch has been relocated to the left under the fuel tank.
The 736cc SOHC incline-four is fitted with cone air filters in place of the stock airbox, with the four individual Keihin carburetors said to have been re-jetted to match. The four-into-one exhaust system exists from a single shorty muffler. Carburetor tuning and a valve adjustment are said to have been carried out in the past month along with installation of a new stator, regulator/rectifier, and lithium ion battery.
The engine was overhauled approximately 15k miles ago according to the previous owner, though supporting records are unavailable. Power is sent to the rear wheel via a five-speed transmission and a drive chain. The bike is equipped with both electric and kick starters. An oil leak from the shifter shaft seal is noted by the seller.