BMW G450X

Last updated
BMW G450X
BMW G 450 X bei Rund um Zschopau 2007.jpg
Manufacturer BMW Motorrad
Parent company BMW
Production2008–2011
PredecessorBMW G650X Challenge
SuccessorHusqvarna TX449
Class Dual-sport, Enduro
Engine 449 cm3 four-stroke single-cylinder
Top speedApproximately 145 Km/h (with coding plug)
Power 30 kW at 7000 RPM (without coding plug); 38 kW at 9000 RPM (with coding plug)
Torque 43 Nm at 6500 RPM (without coding plug); 44 Nm at 7800 RPM (with coding plug)
Transmission Claw-shift 5-speed gearbox integrated into engine casting
Suspension 45mm Marzocchi upside-down telescopic forks, rear Ohlins monoshock
Brakes Hydraulically actuated disc brakes with floating calipers
Tires 90/90-21 (front), 140/80-18 (rear)
Seat height955 mm (unladen)
Weight121 kg (wet)
Fuel capacity8 litres (with 0.75 litre reserve)
Oil capacity1.15 litres

The G450X is an Enduro-class motorcycle that was produced by BMW Motorrad between 2008 and 2011.

Contents

Background and origins

The G450X project originated with BMW Motorrad's desire to capture a portion of the 450 four-stroke enduro class from established manufacturers, including the Japanese big four and KTM. Following the relatively poor sales achieved by BMW's F650GS-derived G650X Challenge, BMW deduced that the Challenge's lack of market acceptance had been due at least in part to its excessive weight and unconventional suspension. The relatively underpowered Challenge had weighed substantially more than competitors like the KTM 640 Adventure, and its pneumatic rear suspension strut was both unadjustable for compression and rebound damping, and expensive to rebuild.

In marketing terms, BMW Motorrad intended to position the G450X as both an enduro-class motorcycle and a viable dual-sport motorcycle. However, its narrow seat, low fuel capacity, small headlight and lack of wind protection meant this notion was questionable. Also, with BMW already producing a variety of dedicated medium-weight dual-sport motorcycles such as the G650GS and twin-cylinder F650GS, the G450X was immediately recognizable as an enduro-only machine.

The design brief for what would become the G450X specified that it should have at least as much power and torque as its established Japanese and Austrian competition, that it should be physically lighter and more compact (thereby also making it easier to ride), and that it should adhere more closely to established design conventions within the 450 four-stroke enduro class. In the process of development, BMW engineers made a number of theoretical improvements on the design baseline established by Kawasaki, Yamaha, Honda, Suzuki and KTM.

The G450X was first presented on 6 November 2007, at the EICMA 2007 trade fair in Milan. [1]

Nomenclature

The G450X's internal BMW model code is K16. The motorcycle's name follows the naming convention for BMW motorcycles. G is a reference to engine series (in this case, single-cylinder). The expected F prefix was reassigned from single-cylinder to parallel-twin motorcycles with the advent of the F800GS and twin-cylinder F650GS at approximately the same time the single-cylinder F650GS was re-designated the G650GS. 450 is a reference to the engine's quoted swept volume of 450 cm3. X signifies Cross, referring to BMW Motorrad's intent to position the G450X as both a dedicated enduro motorcycle and a dual-sport motorcycle.

Frame

Departing from the enduro-class convention of a cradle-style frame in either chrome-molybdenum steel or cast aluminium, the G450X used a bridge-type main frame manufactured from welded stainless steel tubing. The main frame's lower frame tubes bridge the headstock tube and swingarm pivot in a straight line, yielding maximum rigidity for minimum weight. The steel main frame is complemented by a conventional rectangular-profile aluminium sub-frame. The size of the engine's airbox meant that the fuel tank could not be located behind the steering headstock in typical fashion. Instead, the fuel tank is located under the seat, within the confines of the rear sub-frame. The fuel filling arrangement is also unusual, with the fuel filler cap located at the rear of the seat.

Engine

BMW designed an all-new 449 cm3 four-stroke single-cylinder engine utilizing double overhead camshafts with four valves per cylinder, and a balance shaft to reduce vibration. The engine was manufactured by Kymco in Taiwan, on behalf of BMW. Like all modern BMW motorcycle engines, the G450X's engine features automotive-style closed-loop fuel injection, with exhaust oxygen-content sensor. The engine also features integrated coil-over-plug ignition, catalytic converter, and overrun cut-off functionality. [2]

Unusually, the fuel injection/ignition system was not supplied by Bosch, but instead by the Japanese Keihin Corporation. This system is unique to the G450X, and carries BMW designation KMS-K16 (Keihin Management System, applicable to BMW model code K16).

Some technical compromises had to be made to accommodate the G450X's unusual clutch arrangement. One consequence is that the engine's crankshaft rotates backwards instead of forwards, as is typical. The engine is also angled forward at 30 degrees from the vertical to create space for the larger airbox.

The G450X was sold with a EURO 3 noise and emissions-compliant exhaust system that limits it to approximately 40 BHP. If an electronic coding plug supplied with the motorcycle is installed, a second competition-oriented engine management map is enabled. If the coding plug is installed in combination with BMW's G450X-specific Akrapovič competition exhaust muffler, engine power increases to approximately 51 BHP. Connecting the coding plug and/or installing the competition muffler renders the motorcycle not compliant with noise and emissions regulations; therefore, the motorcycle is not road-legal in this configuration.

Clutch

With the design brief specifying both low weight and the improved handling brought by a longer swingarm, the required space was liberated by moving the multi-plate clutch to the right-hand side of the crankshaft. As a consequence, the clutch basket drives the gearbox, instead of the other way around. The drive plate/driven plate/clutch basket assembly is physically smaller than is typical, and the clutch assembly's crankshaft mounting partially negates the need for a separate flywheel. Following existing convention, the clutch is cable-operated and shares the same oil as the engine. [3]

Gearbox

The five-speed claw-shift transmission is integrated with the engine, and has an overall arrangement of gears, shafts and shift forks that was more compact than was typical. [3] The engine and gearbox share a common oil supply.

On enduro bikes made by established competition, the front drive sprocket is located forward of the swingarm pivot, meaning that drive chain tension changes dynamically according to rear suspension movement. In turn, this means the drive chain must always incorporate a certain amount of slack. BMW solved this problem using its Coaxial Traction system, with the front drive sprocket located on the same rotational axis as the swingarm pivot. This is facilitated by the swingarm's locating shaft running through a hollow gearbox output shaft. This arrangement allows the drive chain to be run with minimal slack (around 5mm, as opposed to the typical 25 to 35mm). This reduces chain lash without danger of overstressing the gearbox output shaft bearings, and reduces overall stress on the gearbox assembly.

Although lighter in overall weight, the engine/gearbox arrangement has some inherent disadvantages. Mounting the clutch assembly on the crankshaft means the clutch rotates approximately three times faster than is typical, and the concentric location of the front drive sprocket and swingarm pivot means that the routine task of front drive sprocket replacement requires removal of the rear swingarm.

All G450Xs were supplied to customers with a 15-tooth front drive sprocket installed as standard. Models manufactured from 2010 onwards were supplied with additional 13-tooth and 14-tooth drive sprockets.

Suspension

Although the G450X uses a fairly conventional suspension arrangement, the compact engine/gearbox assembly and concentric rear suspension arrangement allows for a longer-than-normal rear swingarm. The swingarm manipulates a high-quality Öhlins coil-over-shock strut directly, with no rising-rate linkage. The front suspension uses upside-down 45mm Marzocchi forks. The front and rear suspension are both adjustable for compression and rebound damping, although the rear shock absorber does not feature separate high-speed and low-speed compression damping adjustment.

Electronics and fault diagnosis

Unlike many other BMW motorcycles manufactured during the same period, the G450X does not use CAN bus chassis management. Instead, it uses conventional wiring, switches, fuses and relays.

The G450X uses BMW Motorrad's proprietary 10-pin round diagnostic connector. The KMS-K16 engine management system is fully OBD-II enabled, with all conventional fault-diagnostic functions. The motorcycle is compatible with BMW's own workshop diagnostic equipment, and is also supported by the Hex Innovate GS-911 diagnostic module. The diagnostic connector is located on the left-hand main frame tube, behind and below the radiator.

Brakes

Unlike the G650GS-derived G650X Challenge, the G450X does not have anti-lock braking (ABS). The G450X uses conventional disc brakes by Brembo, with a front twin-piston and rear single-piston calipers.

Warranty

The G450X was sold in the United States with BMW's standard motorcycle warranty coverage of three years/36,000 miles, meaning its warranty far exceeded that of any other enduro motorcycle on the market at that time.

Production

The G450X was produced between September 2008, and 2010.

Legacy

The G450X utilized technological approaches that were considered radical by then-current enduro standards, and it failed to overcome the prejudices of buyers who expected more conventional technology. As a result, it did not meet with widespread acceptance. Its production run ended after only three years.

Following the end of the G450X's production run in 2010, its engine and frame formed the basis of three Husqvarna motorcycles from 2011 to 2014: the enduro-oriented TX449, the motocross-oriented TC449 and the rally raid-oriented TE449.

From 2010 to 2012, Husqvarna also offered an enlarged 501 cm3 version of the G450X engine. This was used in the Enduro-oriented TE511 and supermoto-oriented SMR511. Following KTM's acquisition of Husqvarna from the BMW Group in February 2013, all G450X-derived engines were dropped from the Husqvarna range.

The CCM GP450, manufactured from November 2014 until 2017, used a detuned version of the G450X engine.

Related Research Articles

<span class="mw-page-title-main">History of BMW motorcycles</span>

BMW's motorcycle history began in 1921 when the company commenced manufacturing engines for other companies. BMW's own motorcycles—sold under the BMW Motorrad brand—began in 1923 with the BMW R 32, which was powered by a flat-twin engine. Production of motorcycles with flat-twin engines continues to this day, however BMW has also produced many models with other types of engines.

<span class="mw-page-title-main">BMW K100</span> Type of motorcycle

The BMW K100 is a family of four-cylinder 987 cc motorcycles that were manufactured by BMW from 1983 to 1992.

<span class="mw-page-title-main">Honda VFR750R</span> Type of motorcycle

The Honda VFR750R, model code 'RC30', is a fully faired, solo-seat-only racing motorcycle created for homologation purposes for the World Superbike Championship by Honda Racing Corporation (HRC). It was first released to the Japanese market in 1987, released in Europe in 1988 then the United States in 1990. There were only 3,000 made and they sold for US$15,000 - a very large amount for a production bike at the time.

<span class="mw-page-title-main">Yamaha FJ</span> Type of motorcycle

The Yamaha FJ1100 and FJ1200 are sport touring motorcycles that were produced by Yamaha between 1984 and 1996.

<span class="mw-page-title-main">BMW GS</span> Series of BMW motorcycles

The BMW GS series of dual-sport BMW motorcycles have been produced from 1980, when the R80G/S was launched, to the present day. The GS originally stood for Gentleman's Scrambler, but was later renamed to Gelände/Straße. GS motorcycles can be distinguished from other BMW models by their longer travel suspension, an upright riding position, and larger front wheels – typically 19 to 21 inch. In May 2009, the 500,000th GS was produced, an R1200GS model.

<span class="mw-page-title-main">Ducati Multistrada</span> Series of touring motorcycles

First introduced in 2003, the Ducati Multistrada is a series of V-twin and V4 touring focused motorcycles. Essentially a hybrid of a supermoto and a sport-tourer, the Multistrada competes in the market with other dual-sport motorcycles such as the BMW GS. The first iteration of the Multistrada was, like the Yamaha TDM850, neither intended nor suitable for off-road use. Subsequent models were more suited to a proper dual-sport role.

The Killinger and Freund Motorcycle was an attempt in 1935 by a group of five German engineers from Munich to design a more streamlined and modified version of the German Megola front-wheel drive motorcycle. The work took three years to complete but the result was impressive. The engine displacement stayed the same as the Megola at 600 cc but was much lighter and more simplified than a standard 100 cc motorcycle of the time.

<span class="mw-page-title-main">BMW R27</span> Type of motorcycle

The 247 cc BMW R27, introduced in 1960, is a shaft-driven, single-cylinder motorcycle manufactured by BMW.

Motorcycle components and systems for a motorcycle are engineered, manufactured, and assembled in order to produce motorcycle models with the desired performance, aesthetics, and cost. The key components of modern motorcycles are presented below.

<span class="mw-page-title-main">Husqvarna Motorcycles</span> Swedish motorcycle manufacturer

Husqvarna Motorcycles GmbH is an Austrian company which designs, engineers, manufactures and distributes motocross, enduro, supermoto and street motorcycles.

<span class="mw-page-title-main">Yamaha RD500LC</span> Type of motorcycle

The Yamaha RD500LC is a high-performance, two-stroke sports motorcycle, also known as the RZ500 in Canada and Australia. A lightened but detuned version known as the RZV500R was developed for the Japanese home market. Strict United States Environmental Protection Agency regulations meant that the RZ500 was not available for sale in that country. Produced for a short period between 1984 and 1986 it has become a sought after collector's machine.

BMW Motorrad is the motorcycle brand and division of German automotive manufacturer, BMW. It has produced motorcycles since 1923, and achieved record sales for the fifth year in succession in 2015. With a total of 136,963 vehicles sold in 2015, BMW registered a growth of 10.9% in sales in comparison with 2014. In May 2011, the 2,000,000th motorcycle produced by BMW Motorrad was an R1200GS.

<span class="mw-page-title-main">BMW F series parallel-twin</span> Series of motorcycles built by BMW-Motorcycle

The BMW F series is a family of parallel-twin engine dual-sport motorcycles manufactured in Berlin, Germany by BMW Motorrad. Launched in 2008, the range comprises the F650GS, F700GS, F800GS, and F800GSA. In 2012, the F700GS replaced the discontinued F650GS, and in 2013, the F800GSA was introduced with a 24-litre fuel tank and a larger front fairing and screen. The F800GT and F800S both have belt drive.

<span class="mw-page-title-main">BMW F series single-cylinder</span> Type of motorcycle

The BMW F650 is a family of motorcycles developed by BMW Motorrad beginning in 1993. Models included the F650St Strada and from 1994, the F650 which, due to some subtle differences, was considered to be a more dual/multi purpose motorcycle with some off-road capability. The 1993 - 2000 F650 was the first single-cylinder motorcycle from BMW since the 1960–1966 R27, and the first chain driven motorcycles from BMW.

<span class="mw-page-title-main">BMW R65</span> Type of motorcycle

The BMW R65 is a light touring motorcycle introduced by BMW in 1978 to add a mid-size motorcycle to its product line. The original R65, contrary to the views of some commentators, has the same sized frame as the larger R series motorcycles. The R65 does however have a shorter swingarm than its siblings and therefore a shorter bolt-on rear sub-frame; this, along with the shorter front forks and 18" front wheel, gives the illusion that the R65 frame is smaller. The initial model R65 was manufactured until 1984. In 1985 the R65’s engine was put into the same frame and suspension as the R80 which featured a single rear shock absorber (mono-shock). Additionally, between 1981 and 1984, the R65LS was manufactured. This R65 variant has a small triangular fairing that was designed by Hans Muth.

<span class="mw-page-title-main">KTM 690 Enduro</span> Type of motorcycle

The KTM 690 Enduro is a dual-sport motorcycle made by KTM from 2008 to the present day. The 690 Enduro R, introduced in 2009, was initially marketed as a more offroad-oriented version of the adventure-touring-oriented Enduro. The 690 Enduro nomenclature was dropped in 2011; the 690 Enduro R remains in serial production as of January 2024.

<span class="mw-page-title-main">Motorcycle transmission</span> Transmission for motorcycle applications

A motorcycle transmission is a transmission created specifically for motorcycle applications. They may also be found in use on other light vehicles such as motor tricycles and quadbikes, go-karts, offroad buggies, auto rickshaws, mowers, and other utility vehicles, microcars, and even some superlight racing cars.

The KTM 500 EXC is one model in the series of 4-stroke enduro off-road motorcycle made by KTM. They are essentially the 400/450 EXCs with changes to the stroke to achieve larger displacements. The 520, 525, 530 and 500 are all in fact 510.4 cc motors given different model numbers to distinguish them. Like the other KTM enduro offerings, they vary in the set-up and components. The international EXC versions have a small headlight, speedometer, tail-light and somewhat softer linkless (PDS) rear suspension. 2007 was the first year the EXC was deemed street legal in the US. As of 2008 the US version of the EXC, with the new XC-4 motor, continued to be sold in street legal trim. In 2012, the US 50-states street legal 530 EXC-R was rebadged the 500 EXC. In mid 2016, the 2017 bikes were introduced, adding a 250cc version. It joins the 350 and 500 EXC-F.

<span class="mw-page-title-main">KTM 950 Super Enduro R</span> Motorcycle

The KTM 950 Super Enduro R is a dual-sport motorcycle produced from 2006 to 2008. It is equipped with a 98-horsepower, four-stroke, V-twin engine, adjustable heavy-duty offroad suspension, and enduro styling. Due to its light weight and offroad-capable profile, the 950SE was perceived at its launch as a radical departure from any existing dual-sport, enduro, or street bike models, while having characteristics of all three.

<span class="mw-page-title-main">KTM RC250GP</span> Racing motorcycle

The RC250GP is a Grand Prix racing motorcycle designed and built by KTM for the Moto3 class, introduced in 2012. It is also used in the Moto3 Junior World Championship. The RC250GP is raced by KTM's factory racing program as well as supplied to numerous customer teams. The motorcycle is one of the most successful machines of the Moto3 era to date, having taken five constructors' championships, including a clean sweep in 2013 winning every one of the 17 races.

References

  1. "Update Pressemappe EICMA: On Location Fotos BMW G 450 X und neues Datenblatt BMW G 450 X". Pressemappe. Bayerische Motoren Werke AG. 2008-06-03. Retrieved 2018-09-09.
  2. "BMW G 450 X" (PDF). Technische Daten. Bayerische Motoren Werke AG. May 2008. Retrieved 2018-09-09.
  3. 1 2 Peter Mayer (2008-06-05). "Fahrbericht BMW G 450 X". Motorrad. Archived from the original on 2014-12-31. Retrieved 2018-09-09. Ein Bruch mit vielen Gepflogenheiten, der sich auch beim Fahrwerk der 450er zeigt.