How2Day: 1981 CB 900 Honda Specifications

The F-series CB 900 motorcycle was only produced for two years, 1981 and 1982. In 1981 Honda produced two different CB 900 models -- the CB 900FB and the CB 900F2. The difference between the bikes is largely cosmetic, with most of the specs being the same on both bikes. The specs of the 1981 CB 900 Honda are of interest to aficionados of the Honda CB series, as well as those currently considering purchasing the bike.

Both the FB and the F2 bike have air-cooled, transverse four-cylinder 901 cc engines with a dual overhead camshaft and four valves per cylinder. Both engines produce 95 horsepower when the engine runs at 9,000 revolutions per minute (rpm). The F2 produces a maximum of 56.79 ft.-lbs. of torque when running at 8,000 rpm compared to the 56.3 ft.-lbs. produced by the FB when running at 7,500 rpm. Both engines have a bore of 64.5 mm and a stroke of 69 mm for a compression ratio of 8.8:1. The FB performs a standing quarter-mile in 12.2 seconds with the F2 performing the same in 12 seconds. The top speed is 139 miles per hour.

Both the FB and the F2 CB 900 Hondas have five-speed transmissions. Similarly, both bikes have a chain-driven powertrain system.

There is no difference between the tires and brakes used on each bike. The rear wheel takes 130/80-18 tires while the front wheel takes 100/90-18 tires. The brakes on both bikes are also identical. The front brake has two 280 mm discs while the rear brake has one 297 mm disc.

Both bikes weigh a little over 535 lbs. with an empty gas tank. The gas tank holds slightly more than 5 gallons. The bikes get between 41 and 47 miles per gallon.

The 1981 CB 900-series Honda features an adjustable telehydraulic fork for the front suspension. The rear suspension is a swinging arm fork with adjustable shock absorbers.

How2Day