Honda CB900F

First version

Rear: twin shocks 4.3 in travel, adj. compression, damping, rebound Rear: 11.5 in disc Dual piston calipers on all after 1983 Rear:4"×18" (130/80-18)

Background

In 1969 Honda introduced its flagship CB750 superbike, whose success led to Honda's domination of the motorcycle market. Honda had been successful in European endurance racing with their RCB-series RS1000, and had made advances in suspension technology from their experience in motocross, and the company chose to base a new DOHC roadster on their endurance racer.

The CB900F's design was aimed at European markets, rather than the usual focus on the United States, where it was not available until 1981. In the market, the CB900F competed with larger capacity bikes like the Kawasaki Kz1000, Suzuki GS1000, and Yamaha XS1100.

Design

The CB900F's engine has a 901 cc four-cylinder DOHC engine with a bore and stroke of 64.5 by. The engine drew on other designs, such as the CB1000C, CB1100F/CB1100R, and the inline-6 CBX1000. The CB900F has a five-speed gearbox and chain final drive, and it produces 95 bhp at 9,000 rpm The CB900F has two front disc brakes and one rear disk brake, all fitted with dual-piston calipers after 1983. The air-assisted fork was fitted with the Honda TRAC (torque reactive anti-dive control) anti-dive system in 1982 or 1983. The bike shares the same bodywork (tank, side covers, tailpiece) as the earlier CB750F Super Sport. There are similarities between the CB900F bodywork and that of the CB1100F and CBX.

Performance

In magazine tests, the CB900F typically clocked low to mid 12 seconds in the quarter mile (and a low 11.84 seconds in a Motorcyclist magazine test). The engine was tuned to produce mid range power rather than maximizing peak horsepower, thus giving good acceleration from 4,000 rpm to the 9,500 rpm redline. At 90 mph there was some vibration, but the relaxed riding position was comfortable at most speeds, but at the 130 mph maximum speed wind pressure could cause rider discomfort. The CB900F was succeeded in 1983 by the CB1100F, and in 1987 Honda introduced the CBR1000F water-cooled inline fours.

Reception

Honda's advertising proclaimed the bike to be "a thundering Super-Sports bike with devastating performance and an unwavering stamina". Rod Ker, however, writes that it had "two bad habits," that "it dropped out of gear, and — sometimes as a direct result — broke con-rods. This was a great pity, because it was a good bike until it broke, blessed with a frame and suspension that showed the Japanese were catching up with the Europeans in chassis technology."

Second version

Honda 919 (United States) Rear: swingarm with single Showa shock, adjustable preload Rear: single disc Rear:180/55-ZR17 6.4 L/100km CBR900RR

The second version Honda CB900F is a naked motorcycle; being based off a SC33 CBR900RR, but with the removal of fairings, the use of a conventional round headlight, a more upright seating position and revised engine and gearing, providing performance and comfort between a typical sport bike and a traditional standard. It was called the Hornet in Europe and the 919 in North America because the trademark for the vehicle name Hornet in North America was held by Chrysler, acquired after buying AMC, maker of the AMC Hornet car.

In some ways, the concept dates to a 1994 design study created by American Honda's R&D chief product evaluator Dirk Vandenberg in cooperation with Cycle World magazine, a streetfighter-like one-off custom based on the Honda CBR900RR, with the fairings removed, high, tubular handlebar, and tuning and gearing modified to boost low-end torque.

It was introduced in 2002 In 2006, Motorcyclist recommended used 919s as a good buy, saying of the new bike, "at $7999, it wasn't exactly cheap, and saddled with a coat of flat-black paint called Asphalt, it was less than visually electrifying," however, in the used market it became a great value. In the US market, the 919, like the 599, was expensive, because, being intended for the European market, they were made in Italy, and so had to be imported to the US against unfavorable Euro exchange rates.

The Daily Telegraph welcomed the new bike, saying, "the new CB900F Hornet leaves your knees in the breeze and your smile full of bugs as it reintroduces you to a feeling of undemanding, rewarding two-wheeled fun that has been missing from the market for a long time." Comparing it to the Hornet 600, the bike was reminiscent of the standards of the 1970s, sometimes called Universal Japanese Motorcycles.

Design

The CB900F is powered by de-tuned SC33 Honda CBR900RR engine, developed by Tadao Baba, one of Honda's Large Project Leaders. The motor is a transversely mounted, liquid-cooled, fuel-injected 919 cc in-line four-stroke, four-cylinder DOHC engine that produces around 100 hp. The engine has cast camshafts and pistons instead of the more expensive forged versions found on the CBR929 and later. For greater midrange torque, the CB900F's camshaft lift is lower, and compression is slightly lowered. Four 36 mm fuel-injection throttle bodies take the place of the CBR900RR's 38 mm carburetors. Redline is 9500 rpm. The bike has a cable-actuated clutch, a six-speed transmission, and a chain final drive.

A steel, square-tube backbone frame supports the stressed member engine. In front, a cartridge fork (adjustable beginning in 2004) guides the wheel, while a single Showa shock, adjustable only for preload (and rebound damping beginning in 2004) connects with the aluminum swingarm and carries the weight in back. Its brakes are dual-disc in the front and single-disc in the rear.

Instrumentation consists of an analog speedometer and tachometer and basic indicator lamps, incorporated under a tinted window, and a single tripmeter. While it normally was equipped with a centerstand, California models did not have room for one due to additional emissions control equipment.

The rake is 25°, trail is 98 mm, wheelbase is 1460 mm, and seat height is 800 mm. It has a tested dry weight (minus fuel only) of 455 lb and a tested wet weight of 485 lb. The chain drive is a 530 chain with stock gearing of 16 tooth front and 43 tooth rear sprockets.

A 599 cc carburetted version exists in the form of the CB600F, known as the Hornet 600 in Europe and the 599 in North America.

Performance

Quarter-mile performance for the second generation bike was 11.18 seconds at 120.7 mph tested by Motorcyclist, Having the lowest weight in its class and a good power-to-weight ratio, it stands well in comparison to bikes with greater output like the Yamaha FZ1, and the wide, high handlebars ease quick turning and make cornering enjoyable. The suspension of the early versions was criticized, but after the upgrade to an adjustable fork, the complaints died down. Cycle World saw the 919 as a practical solution to the real-world problem of imperfect roads and traffic, rather than a mere compromise between a sportbike and a commuter or touring ride.

Notes

References

References

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