The Honda CR250R was a Hondaracingdirt bike. The prototype was built in 1971, but it was not until late 1972 that production of the 1973 model "out of the box racers" began sale to the general public. The CR250 was produced for nearly 37 years, 2007 being the final year of production.[2]
In 1997, Honda produced an industry first, an aluminum chassis for a motocross motorcycle. These 'first gen' frames were thick, rigid, and were a big change from the previous steel frames, where flexibility had been seen as a problem in the early years. The 1997-8 engines were equipped with a new stator, which supplied DC voltage for the new Keihin carburetor with an electronic 'Power Jet' system, in efforts to control lean mixture preignition. Included in the new electrics was a capacitor and a rectifier/regulator. The 1999 model was almost identical but the Power Jet had disappeared.
For 2000, the 'second gen' aluminum frame was less rigid, with thinner twin-spars, providing a rigidity decrease and better handling. The Keihin PWK carburetor replaced earlier PJ models. The CDI box limited RPMs to 8000. The 2001 model was nearly identical, with a change to a different CDI box, adding 500 RPM to the redline where two more horsepower lurked. The new Mikuni TMX carburetor proved to be temperamental to weather changes.
For 2002, Honda ended the outstanding interchangeability that had existed from 1992~2001, when a completely new engine arrived with a change from cylinder reed induction to an engine case reed induction system and an electronically controlled, cable operated RC valve in place of the centrifugally operated exhaust valve system used since 1992. A TPS (Throttle Position Sensor) was added to the carburetor, powered by a new stator. The ECM would now be able to retard ignition timing to preclude preignition, though there was no ping sensor anywhere.
The third & final generation of the CR250 aluminum chassis also made its appearance, which was thinner, with better flex properties. The same engine & chassis, with minor suspension & plastics changes, continued on until production of this 2-stroke stopped in 2007. Although the case reed engine has potentially the best design, it was never developed to its full potential by Honda, as the industry attention rapidly turned to four stroke engine development. Many owners of the final generation of the CR250 felt the need to turn to the aftermarket to bring that engine to its full potential. The 2001 models continue to be savored by lovers of the CR250, considered the best of the best ever produced.
The Honda Magna is a cruiser motorcycle made from 1982 to 1988 and 1994 to 2003 and was the second Honda to use their new V4 engine shared with the VF750S Sabre and a few years later a related engine was fitted to the VF750F 'Intercepter', the later models used a retuned engine from the VFR750F with fins added to the outside of the engine. The engine technology and layout was a descendant of Honda's racing V4 machines, such as the NS750 and NR750. The introduction of this engine on the Magna and the Sabre in 1982, was a milestone in the evolution of motorcycles that would culminate in 1983 with the introduction of the Interceptor V4. The V45's performance is comparable to that of Valkyries and Honda's 1800 cc V-twin cruisers. However, its mix of performance, reliability, and refinement was overshadowed by the more powerful 1,098 cc "V65" Magna in 1983.
The Honda XR series is a range of four-stroke off-road motorcycles that were designed in Japan but assembled all over the world.
The Honda VFR400 series of motorcycles were a related series of 399 cc V4-engined motorcycles, which were essentially scaled-down versions of the larger VFR race models of the day. They were mainly developed for, and sold in, the Japanese domestic market, in part due to the tougher motorcycle drivers' license restrictions in Japan at the time for bike exceeding 400cc.
The E-series was a line of inline four-cylinder automobile engines designed and built by Honda for use in their cars in the 1970s and 1980s. These engines were notable for the use of CVCC technology, introduced in the ED1 engine in the 1975 Civic, which met 1970s emissions standards without using a catalytic converter.
The Honda A series inline-four cylinder engine is used in 1980s Honda Accord and Prelude models. It was introduced in 1982, with the second-generation Honda Prelude, and available in three displacement sizes: 1.6-, 1.8- and 2.0-liters. It features cast iron block and aluminum SOHC head design with three valves per cylinder for a total of 12 valves. It was available in carbureted and fuel-injected configurations
The Honda CR series is a range of off-road motorcycles made by the Honda corporation from 1973 onwards.
The two-stroke power valve system is an improvement to a conventional two-stroke engine that gives a high power output over a wider RPM range.
A motorcycle engine is an engine that powers a motorcycle. Motorcycle engines are typically two-stroke or four-stroke internal combustion engines, but other engine types, such as Wankels and electric motors, have been used.
The Honda RVF750R RC45 was a fully faired racing motorcycle created for homologation purposes for the Superbike World Championship by Honda Racing Corporation. The RVF750R was the successor to the VFR750R RC30. Like its predecessor, the RVF750R featured a DOHC liquid-cooled V4 4-stroke engine with gear driven cams and a single-sided swingarm, but unlike the RC30 it utilized electronic fuel injection, in a setup very similar to the production 1992 NR750. The US spec engine had a 749.2cc capacity and was rated at 101 horsepower; the European version was rated at 118 horsepower. A simple rewire modification to the PGM-FI box increased power in the US engine up to the 118 hp. It was manufactured from 1994 until 1995 and sold in limited numbers, followed by the VTR1000R SP-1 RC51 in 2000. Unlike the VFR750R RC30 and VFR750F from which the engine was originally derived the gear drive for the cams was moved from the centre of the engine in between the cylinders to the one side allowing a slightly narrower engine.
The Yamaha FZR1000 is a motorcycle produced by Yamaha from 1987 to 1995. Classed as a sports motorcycle.
The Yamaha WR450F is an off-road motorcycle made by Yamaha Motor Company. It currently has a 450 cc (27 cu in) liquid-cooled single-cylinder engine. First offered in 1998 at 400cc, it shared many components and design concepts with the YZ400F motocross model. It is basically the racing YZ450F detuned slightly for more controllable power, with a headlight and lighting coil, softer suspension, a kickstand, lower noise specifications, larger radiators and lower emissions. The WR in the name indicates a wide-ratio gear box common to most enduro or trail bikes and stands in contrast to the close-ratio gearbox essential to a motocross racer. Over the years the WR has benefited from the advances made in the YZ motocross version gaining displacement and advancements such as an aluminum frame and improved suspension. Over much of its life the weight of the WR450F has remained fairly constant ranging from 244 to 249 pounds dry weight.
The Honda XR250R and XR250L are trail and dual-sport motorcycles made by Honda from 1979 through 2004, as part of the Honda XR series. They have four-stroke, SOHC four-valve 249 cc (15.2 cu in) single-cylinder engines.
The Kawasaki Ninja ZX-9R is a motorcycle in the Ninja sport bike series from Japanese manufacturer Kawasaki, produced from 1994 until 2003. There were five model incarnations across two basic designs.
The Honda Transalp is the XL400V, XL600V, XL650V, XL700V, and XL750 series of dual-sport motorcycles manufactured in Japan by Honda since 1987. With the exception of XL750, the Transalp bikes series feature a liquid-cooled, four-stroke 52° V-twin engine.
A motorcycle frame is a motorcycle's core structure. It supports the engine, provides a location for the steering and rear suspension, and supports the rider and any passenger or luggage. Also attached to the frame are the fuel tank and battery. At the front of the frame is found the steering head tube that holds the pivoting front fork, while at the rear there is a pivot point for the swingarm suspension motion. Some motorcycles include the engine as a load-bearing stressed member; while some other bikes do not use a single frame, but instead have a front and a rear subframe attached to the engine.
The Honda CR125M Elsinore is a motorcycle designed and manufactured by Honda and released in late 1973. Modeled after the first Elsinore, the Honda CR250M, the 124cc version sold for $749 at its debut. A CR125M ridden by Marty Smith won the 1974 AMA National Motocross championship, spurring the Elsinore's popularity. The September 1973 issue of Dirt Bike argued that the 125 Honda Elsinore was the only off-road bike on the market at the time that offered both speed and reliability. Other Japanese 125cc motocross bikes available at the time would have needed major suspension, motor, and chassis upgrades to be used for motocross racing.
The Yamaha YZ450F is a four-stroke racing motocross bike built by Yamaha Motor Corporation. It was the successor to the previous YZ426F which was discontinued in 2003. It is credited by Cycle World and Dirt Rider magazines as the bike that started the four-stroke dirt bike revolution. The 2006 YZ250F and YZ450F were the first production motorcycles equipped with titanium suspension springs.
The TRX 450R is high performance All-terrain vehicle manufactured by Honda powersports. It was produced from 2004 to 2014.
The Kawasaki KR-1 and KR-1S are road-orientated 249 cc (15.2 cu in) two-stroke sports bikes introduced between 1988 and 1992 by Kawasaki Heavy Industries.
The Aprilia AF1 is a sports motorcycle, designed, developed and built by Aprilia between 1986 and 1993. It came in two version; 50 cc (3.1 cu in), and 125 cc (7.6 cu in).
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