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Home » BMW Motorcycle, motorcycle

BMW G450X 2009

Submitted by on March 29, 2012 – 11:36 pmNo Comment

Although BMW virtually invented the Adventure class with the iconic, go-anywhere GS, and proved they weren’t afraid of getting dirty with multiple wins in the grueling Paris-Dakar Rally, this new bike represents BMW’s first serious gambit into the tumultuous off-road arena for the consumer. I see now that the enigmatic HP2 was merely an aperitif, hinting at the company’s more serious dirt-oriented aspirations. The G450X, a wholly fresh creation boasting some innovative design cues wedded to BMW’s signature sophisticated engineering, was rolled out last week in Marbella, Spain for the world press.

Quite simply, the “G” designation of the 450 denotes a new Generation motorcycle for BMW. The nascent machine borrows some prominent internal technical DNA from the K-series sportbike, its aggressive, all-business off-road persona wrapped up handsomely in BMW’s striking racing livery of blue accents on bright white. The bike gets a “beak” front fender – made popular by its GS brethren – with sparse bodywork shaped by sharp angles that render an arrow-like wedge look. Razor-thin and compact, the 450 is a dynamic-looking machine.

Aesthetically, the most prominent design element of the 450 is the tubular frame. Constructed of twin cross tubes of stainless steel mated to forged union points, the chassis design foregoes the traditional undercarriage that cradles the motor. Instead, the main tubes run at a 45-degree angle from the beefy steering stem directly to the swingarm pivot. It is rudimentary engineering, designed to transmit the intense forces absorbed through the front forks to the machine’s center of mass via the most direct route. By comparison, a traditional under-slung frame carries the energy of impact through a somewhat circuitous route. The 450X’s unique chassis design requires less tubing than a conventional frame, resulting in an extremely light unit that nonetheless delivers exceptional rigidity. Replacing the natural protection afforded by conventional under-slung chassis tubes, the G450X is equipped with an ultra heavy-duty bash plate that is mounted in shock-absorbing rubber.

That heavy-duty skid plate protects a liquid-cooled 449cc single-cylinder DOHC 4-stroke motor. Developed in-house, the powerplant borrows technology from BMW’s “K” bike in the form of a short-stroke (59.6mm) combined with a compact 4-valve head. Electronic fuel injection feeds the engine through a dual throttle valve. Crankshaft and connecting rod are roller bearing-mounted. A forged lightweight 2-ring piston drives the combustion process.

As a street-legal platform, the G450X was designed to comply with the exceedingly strict European emissions standards. However, U.S. recipients – under a different emission code – will benefit from the new bike being imported with an electrical “plug” that boosts horsepower significantly, adding 11 ponies to the European model, bringing output up to a solid 51 hp. In stock Euro mode the bike is no slouch, pumping out decent low-end, mid-range and top-end. However, the additional (U.S.) power is significant and gets spread out fairly evenly over the entire powerband, really showing itself on the top end when screaming the 450cc single in the upper rpm range. The importing transformation (which is actually about a two-minute procedure that involves removing a side panel and plugging the connector loop into place) helps to smooth out the engine at idle and low rpm.

In a unique configuration, the cable-operated small-diameter multi-disc clutch sits directly on the crankshaft, the layout contributing to the 450’s short engine length. An intermediate shaft transfers power to the gearbox, which means the G450X’s crankshaft rotates backwards. The compactness of the engine allowed it to be rotated forward a full 30-degrees to help shift more weight onto the front tire for better bite. Also, tilting the engine in the chassis created enough room for the air intake duct to come in vertically from above in a relatively straight configuration for optimum performance. The lack of traditional chassis down-tubes coming off the steering stem allows for a one-piece, large-capacity radiator. The lightweight unit is equipped with a fan to help draw air through the cooling webs at low speeds.

otomaps source article: www.netcarshow.com www.motorcycle.com www.roushperformance.com

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