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Honda Cx Series by betty

Power train

Engine

The CX series motorcycles feature a crankshaft configuration aligned longitudinally with the axis of bike, sometimes called a "flying" V-twin, because the cylinders point up on either side of the motorcycle but are not symmetrical. The CX was the first V-twin motorcycle that Honda ever built. Honda built a prototype CX350 but it was never released to the public. In this version the cylinders did not have the characteristic 22degree twist. Initially conceived as having a full 90degree angle between the cylinders like the similar Italian Moto Guzzi machines, early testers reported that the prototypes were too smooth. Also, the carburetors, which projected directly rearward from the cylinders, tended to interfere with the knees of riders. Subsequent engine designs had their V-angle tightened somewhat to 80degrees, and the heads twisted inward at the rear by 22degrees.

An innovative design places the crankshaft *above* the transmission, with both in the same housing. This keeps the engine short but quite tall.

The engine design combines a 10.0:1 compression ratio and 9,650rpm redline with overhead valves and a camshaft nestled at the base of the V between the cylinders. There are four overhead valves per cylinder, with unique forked rocker arms acting off each pushrod. The engine runs well on 87octane petrol. It delivers nearly 50hp (37kW) at 9500rpm with high low-speed torque characteristics. The Honda CX series machines claimed to outperform other motorcycles of comparable displacement. The motorcycle readily achieves a fuel efficiency of 45 miles per gallon, with figures of over 50mpg not at all uncommon[citation needed]. Moto Guzzi, however, with their contemporary V50 Monza, delivered 48hp at 7600rpm. This was from an air-cooled, 2 valve 90 V-twin which delivered well over 55mpg but also had the standard Italian foibles of the time with its questionable electric reliability. This Guzzi model is little known outside Europe, so a direct comparison with Honda's CX 500 is possible only on paper or amongst motorcycle enthusiasts.

The cylinder bores are cast in the crankcase which complicates the overhaul process although many examples have gone 200,000 miles or more without any major engine work.

Transmission

The transmission spins opposite the engine crank to counteract the engine torque's tendency to tip the bike slightly to one side when the throttle is opened or closed. The gear shift lever is moved with the usual up-down motion of the left foot, but instead of rocking in a forward-backward motion as on regular bikes, it moves left-right. This difference is transparent to the rider, however, and requires no change in shifting technique. It also means that it is not possible to adjust foot peg and gear lever setup when personalizing riding position.

Power is transferred via an enclosed splined driveshaft with one universal joint. The shaft drives a bevel gear to which the wheel is joined via a cush-drive, which absorbs and dampens driveline shocks and vibrations. The bevel drive spins in an oil bath, and a zerk fitting is provided for greasing the shaft bearing. This reduces the motorcycle's maintenance costs.

Wheels

The original Com-Star wheels combine the flexibility of spoked wheels (without the maintenance burden) with the strength and tubeless characteristics of one-piece wheels. This was one of the first production motorcycles to be equipped with tubeless tires along with the CBX six. Honda introduced the Com-Star wheels a year or so earlier on the CB250T/400T Dream as well as on the CB750F2 and GL1000 Gold Wing, although these featured standard rims that demanded inner tubes to be used.

Chassis

Early versions had conventional suspension, consisting of hydraulically damped telescoping front forks and dual coil-over shocks at the rear. Later versions had air-assisted forks and featured Honda's Pro-Link monoshock rear suspension. US bikes (except GL500I, GL650I and Turbo) were equipped with a single front disk brake whereas all other bike possess dual front disk brakes. Models after 1980 sport dual piston callipers replacing the single piston calliper of the earlier models. For the Turbo and Eurosport models the rear drum was replaced with a dual piston calliper and disk. All models feature steel tube frames with a large backbone, with the engine used as a stressed member. The dual shock models use a single tube backbone whereas the later Pro-Link models employed a triple tube backbone. Later models are blessed with larger front forks which provides a noticeable improvement in handling.

Variants

CX500

The 1978 CX500 Standard had a large fuel tank, stepped seat, a round brake fluid reservoir and a plastic mini-fairing that was thought to look unusual at the time, and gave the bike the nickname "plastic maggot". Turn signals extend out through the mini fairing from the headlight's centerline. The CX500 Standard had silver Comstar wheels, 19inch in front and 18inch in the rear.

While V-twins were nothing new, Moto Guzzi had been mounting them "in line" with the frame with shaft drive for many years, this Honda was decidedly different. Not only was the 500cc engine water cooled, but it had four valves per cylinder that were operated by pushrods rather than more conventional overhead cams.

The styling was radical, upright forks and a short engine contributed to a stubby wheelbase on a bike that was rather tall. The CX500 was one of the first recipients of Honda's new Comstar wheels (and later, on B models, reverse comstar and a square brake fluid reservoir), which measured 19inches (480mm) in front and 18inches (460mm) at the back.

The fuel tank tapered toward the front and a huge half-moon tail light jutted out from a short fairing behind the radically stepped seat. The end result was a mix of standard, sport, and cruiser features.

The CX500 met with a good degree of success. It proved to be reliable and economical, being the least-expensive shaft-drive bike. Many examples still exist today, and along with the GL Silverwings, are fast becoming cult bikes. There are owners clubs throughout Europe and the rest of the world.

CX500EC Eurosport

Introduced in 1982 the EC variant is a much improved motorcycle compared to the original 500. Sharing many parts with the CX500 Turbo introduced the same model year, the Eurosport features air assisted front forks with anti-dive mechanism and air assisted prolink single shock rear suspension. The wheels are also modified, with an 18 inch diameter restyled round hole comstar front with a 10090H18 tyre, whilst on the rear is a 12080H18 tyre. The brakes are vastly improved with much more effective twin pot calipers on the front and a new disc brake with twin pot caliper on the rear replacing the original drum. The Eurosport is also significantly restyled with a larger fuel tank, a nose fairing, side panels, seat, and tail unit that share much more modern lines. In the UK only two colour options were made: white metallic with blue and red striping, or black with orange and silver stripes. The instrumentation is improved with the introduction of a fuel gauge and like the rest of the bike a much updated appearance. Plastic mudguards replace the chromed steel versions on the earlier machines curing the associated rust problems. The round headlight of the early bikes is also replaced with a rectangular lens which gives improved night lighting.

The changes extended to the engine where Honda's early 1980s issues with cam chains were dealt with via the introduction of an automatic tensioner replacing the manual version on the earlier models. Other changes also meant that the standard valve clearances were reduced, possibly through tighter manufacturing control. Eurosport model engines are identifiable via the lack of a cam chain tensioner bolt and the revised valve covers which feature black painted stripes and satin alloy flat areas.

The changes made the 500 Eurosport significantly better to both look at and ride, and more reliable than the previous versions. The later CX650ED shared the majority of the cosmetic changes introduced by the 500EC, whilst in Japan a 400cc version was introduced with the same styling to comply with licence rules.

CX500 Turbo

In 1982, this version of the bike received a turbocharger and a very complex fuel injection system with multiple redundant fail-safe systems. The following year, all CX500s and GL500s were enlarged to 650 (actually 673cc), and the turbo version got a much simplified fuel injection system. Factory turbos fell out of favor with the motorcycling public for various reasons, causing Honda to cease production of the CX650 Turbo after the 1983 model year.

The CX500T was the world's first turbo-charged production bike, as opposed to the Z1R TC which was fit with an aftermarket RayJay turbo by Turbo Cycle Corporation, before shipment to select Kawasaki dealers. The CX500T also featured fuel injection and a radical fairing. The CX500 Turbo (also known as the CX500TC) was only produced for the 1982 model year and was superseded for the 1983 model year by the CX650 Turbo which was itself based upon the naturally aspirated CX650. The CX500 Turbo was sold only in limited numbers, with a total of around 5,400 manufactured.

The Turbo's powerplant was based on the water-cooled V-twin with four pushrod-operated overhead valves per cylinder used in the shaft-drive CX500 introduced a few years earliertself a groundbreaking design. In fact, the engine case was retained nearly intact from the original CX500, having been designed from the outset to accommodate turbo-charging. The turbocharger, at peak boost providing approximately 19 psi of over-pressure, nearly doubles the power output of the engine when on-boost. The engine case is one of the few items carried over from the original CX500; the suspension, brakes, frame and fairing all differ significantly from the earlier CX500. The base engine also was used in the Honda GL500 Silver Wing, a touring machine aimed at being the Gold Wing's little brother, and the CX500C, a custom model with chopper styling.

The CX500 Turbo, although capable of superb acceleration when on-boost, suffers somewhat from an abrupt and large step in power when transitioning from off-boost to on-boost. Furthermore, being the first production Honda motorcycle with fuel-injection, the engine control system is complex and, by current standards, quite bulky, requiring two separate enclosures as well as a number of pressure-carrying hoses.

CX500 Custom

The "Custom" variant, introduced in 1979, had a smaller, narrower tank and buckhorn handlebars that made the bike more Harley-esque. The headlight and gauges were similar to the CX500 Deluxe. Turn signals were now mounted along the fork tubes, below the level of the headlight. This model set its sights on more of a cruiser style and image-conscious rider.1982 was the last model year for the CX500. In 1983 it was bumped up to 673cc and became the CX650. The CX650's styling was radically different, and the engine was painted black instead of silver. The CX650 could not compete against the comparably-priced, but much more powerful VF750 Magna, and was dropped the following year.

CX500 Deluxe

The "Deluxe" model appeared in 1979. This bike looked nearly identical to the original CX500 Standard, with the exception of regular (85mph) gauges and headlight (the mini fairing was removed) and black reversed Com Star wheels - 19inch front and 16inch rear. 1981 was the final year for the CX500 Deluxe model.

GL500 Silverwing

Main article: Honda GL500

In 1981 Honda released the GL500 Silverwing, which was a mid-sized touring bike based on the CX500 engine. The GL500 engine was similar to the CX500 engine, but had the more reliable transistorized ignition system, so that the stator could contain only charging windings, and thus put out more power for operating lights and electronic devices commonly added to touring machines. The GL500 also sported Honda's Pro-Link monoshock rear suspension, and was available both as a naked bike, as well as an Interstate model which included a large factory fairing and hard saddlebags and trunk. This made the Silverwing look like a miniature GL1100 Goldwing. The 1981 model had a small tail trunk, 1982 GL500s and 1983 GL650s had a larger trunk. The trunk was interchangeable with the back seat--the bike is rider-only with the trunk installed, although there was an aftermarket extender available to allow the trunk to be mounted behind the passenger seat. In 1983 the GL500 was upgraded to the GL650, and that was the last model year in the USA. Model years can sometimes be confusing, however, as the 1982 GL500 was seriously overproduced, with some selling new as late as 1984. They should still be titled as 1982s, but there are cases where they haven't been.

GL650 Silverwing

Main article: Honda GL650

The GL650 Silverwing is just a bigger version of the GL500. The frame and all running gear is essentially the same, but the front engine hanger mount and fairing mounts are slightly different, and portions of the engine are painted black. Both Standard and Interstate models were available in burgundy or dark gray paint schemes. This was the only year for the GL650 in the US.

This bike gets better gas mileage than the GL500 due to significantly taller gearing. The 650 engine also finally replaces the CX/GL500's mechanical fan with an electric one. Losing the mechanical fan probably contributes to the better gas mileage as well, but it's uncertain how much.

CX650C

The CX650 Custom was a one year model produced in 1983 for the US market. Its unique cruiser type styling sets it apart from all other CX variants. The frame is completely different, and the styling was marketed to accommodate the American desire for the low stretched look of American cruiser bikes. Its semi chopped fork, tear drop tank, low seat and truncated exhaust gave it a very rakish and appealing look. However, it was very similar in styling and price range to the 750 Shadow and Honda elected to have only one cruiser bike in that class, thus the reason for its short model life.

CX650ED

The CX650ED or Eurosport was also introduced in 1983 and was cosmetically very similar to the CX500 Eurosport produced to previous year. It was aimed at the UK, European, Canadian, and Australian markets and is really a superb motorcycle. The brakes, suspension and handling were far in advance of the CX500 variants, except for the Turbo of course, with which it shares many common features (TRAC anti-dive forks, Pro-Link rear suspension, twin-pot brakes and disc front and back. Unfortunately this model was not sold in the US although some have been imported by private owners.

CX650T

In 1983, the engine of the CX500 Turbo was bumped up to 673cc which meant an increase from 77 to 97horsepower, making it one of the more powerful motorcycles available that year. In addition to the increase in displacement, the compression ratio was increased while the maximum boost pressure was lowered, making for a less abrupt transition from off-boost to on-boost than was present in the earlier CX500 Turbo. The fuel-injection control system was substantially revised for the CX650 Turbo, and the rear shock received an update as well by adding a manually operated damping control mechanism. Cosmetically, the CX650 Turbo differs from its predecessor primarily in color and badging. However, in a cost cutting exercise, Honda manufactured the 650 Turbo fairing from ABS plastic as opposed to the 500 turbo's GRP. It is one of the rarest production Hondas ever, with only 1,777 built and fewer than 1,200 imported to the U.S. and Canada. The rest were distributed around the world but not sold in the Australian market.

With their complex fuel injection systems and related sensors and actuators, the CX Turbos carried high prices and were a nightmare for shade-tree mechanics. And while spiraling insurance rates were affecting all performance bikes, many insurers looked unfavorably at turbocharged models in particular, assessing them with exorbitant premiums. So although the whistle of the turbo and resulting kick of acceleration boiled the adrenaline of those who rode one, the CX650 Turbolong with the imitators that soon followedadly suffered a premature extinction.

Other variants

The Japanese and European market saw 400cc versions of the CX and GL, aptly named the CX400 and GL400. In Japan the GL650 SilverWing Interstate was released as the Limited Edition GL700 Wing Interstate, although it used the same 674cc engine that was used in the GL650. Also in Australia, the 1980-1982 CX500 'standard' models were known as the "CX500 Shadow". This made for much confusion when Honda released the VT500 and VT750 "Shadow" in 1983.

Influence of CX design

The CX series motorcycle has had an influence on the design of Honda's successful ST1100 and ST1300 Pan European models. These also feature longitudinal, or "flying V" engines and shaft drive, although they have four cylinders, fairings and luggage. Early influence for the CX engine design is believed to have come from the Marusho Lilac motorcycle where it is rumored that engineers went to work for Honda when Marusho finally went bankrupt in 1967.

References

^ "Honda Motorcycles - A Five Decade Journey". http://motorhelmets.com/htm-service/resources-motorcycle-articles-honda-history.htm. Retrieved 2007-08-31.

^ "Moto Guzzi V50 Monza review". BikePoint. http://www.bikepoint.com.au/portal/alias__bikepointau/tabID__5760/ArticleID__118663/DesktopDefault.aspx. Retrieved 2007-08-31.

^ 1978-1982 Honda CX500, Motorcycle Classics, March/April 2008, http://www.motorcycleclassics.com/Restoration-Technical/2008-03-01/Honda-CX500.aspx, retrieved 2009-02-25

^ Margie Siegal (May/June 2009). "1983 Honda CX650T". Motorcycle Classics. http://www.motorcycleclassics.com/motorcycle-reviews/1983-honda-cx650t.aspx. Retrieved 2009-08-04.

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