The Honda CX series
motorcycle
A motorcycle (motorbike, bike, or trike (if three-wheeled)) is a two or three-wheeled motor vehicle steered by a handlebar. Motorcycle design varies greatly to suit a range of different purposes: long-distance travel, commuting, cruising ...
s, including the GL500 and GL650 Silver Wing variants, were developed and released by
Honda
is a Japanese public multinational conglomerate manufacturer of automobiles, motorcycles, and power equipment, headquartered in Minato, Tokyo, Japan.
Honda has been the world's largest motorcycle manufacturer since 1959, reaching a product ...
in the late 1970s, with production ending in most markets by the mid 1980s. The design included innovative features and technologies that were uncommon or unused at the time such as liquid cooling, electric-only starting, low-maintenance
shaft drive
A drive shaft, driveshaft, driving shaft, tailshaft (Australian English), propeller shaft (prop shaft), or Cardan shaft (after Girolamo Cardano) is a component for transmitting mechanical power and torque and rotation, usually used to connect ...
, modular wheels, and dual CV-type
carburetor
A carburetor (also spelled carburettor) is a device used by an internal combustion engine to control and mix air and fuel entering the engine. The primary method of adding fuel to the intake air is through the venturi tube in the main meteri ...
s that were tuned for reduced emissions. The
electronic ignition
An ignition system generates a spark or heats an electrode to a high temperature to ignite a fuel-air mixture in spark ignition internal combustion engines, oil-fired and gas-fired boilers, Rocket engine#Ignition, rocket engines, etc. The widest ...
system was separate from the rest of the electrical system, but the motorcycle could only be started via the start button.
Power train
Engine
The CX series feature a crankshaft configuration
aligned longitudinally with the axis of bike, similar to the
Moto Guzzi
Moto Guzzi is an Italian motorcycle manufacturer and the oldest European manufacturer in continuous motorcycle production.
Established in 1921 in Mandello del Lario, Italy, the company is noted for its historic role in Italy's motorcycling ma ...
layout. Unlike a "boxer"
flat-twin
A flat-twin engine is a two-cylinder internal combustion engine with the cylinders on opposite sides of the crankshaft. The most common type of flat-twin engine is the boxer-twin engine, where both pistons move inwards and outwards at the same ti ...
, the cylinders protrude at an angle above the horizontal. The included angle of the CX is 80°, and the heads are twisted 22° so that the inlet tracts do not interfere with the rider's legs. A camshaft nestles at the base of the V between the cylinders. Although Honda generally favors OHC engines, the cylinder head twist necessitated the use of stubby pushrods to operate the four
overhead valve
An overhead valve (OHV) engine, sometimes called a ''pushrod engine'', is a piston engine whose valves are located in the cylinder head above the combustion chamber. This contrasts with earlier flathead engines, where the valves were located be ...
s per cylinder, with a forked rocker arm acting off each pushrod. The 5-speed transmission is located below the crankshaft, with both in the same housing, an arrangement which keeps the engine short (length wise) but quite tall. The engine has a 10.0:1 compression ratio and 9,650 rpm redline. Just as with the
Honda Gold Wing
The Honda Gold Wing is a series of touring motorcycles manufactured by Honda. Gold Wings feature shaft drive and a flat engine. Mooted by press in September 1974 as "The world's biggest motor cycle manufacturer's first attack on the over-750cc ...
, the transmission rotates opposite to the engine to help counteract the engine torque's tendency to tip the bike slightly to one side when the throttle is opened or closed.
The CX was the first
V-twin
A V-twin engine, also called a V2 engine, is a two-cylinder piston engine where the cylinders share a common crankshaft and are arranged in a V configuration.
Although widely associated with motorcycles (installed either transversely or longit ...
motorcycle that Honda ever built. It was initially designed as a 90 ° V-twin. Honda built a prototype CX350 but it was never released to the public. In that version the cylinder heads did not have the cylinder-head twist.
Transmission
Final drive is with a shaft. Power is transferred by an enclosed splined
driveshaft
A drive shaft, driveshaft, driving shaft, tailshaft (Australian English), propeller shaft (prop shaft), or Cardan shaft (after Girolamo Cardano) is a component for transmitting mechanical power and torque and rotation, usually used to connect ...
with one
universal joint
A universal joint (also called a universal coupling or U-joint) is a joint or coupling connecting rigid shafts whose axes are inclined to each other. It is commonly used in shafts that transmit rotary motion. It consists of a pair of hinges lo ...
. 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 grease-nipple is provided for greasing the shaft bearing.
Wheels
The
ComStar wheels
The Comstar wheel, sometimes referred to as Com-stars or stylised as ComStar, was a composite motorcycle wheel that Honda fitted to many of its motorcycles from 1977 to the mid 1980s. Its design allowed it the option of being fitted with tubeles ...
combine the flexibility of spoked wheels with the strength and tubeless characteristics of one-piece wheels. 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 required inner tubes. The CX500 was the first production motorcycle to use tubeless tires.
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 disc brake whereas all other bike possess dual front disc brakes. Besides the 'vanilla' CX500B, models after 1980 sport dual piston calipers replacing the single piston caliper of the earlier models. For the Turbo and Eurosport models the rear drum was replaced with a dual piston caliper and disc. 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.
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. Turn signals extend out through the mini fairing from the headlight's centerline. The CX500 Standard had silver Comstar wheels, 19 inch in front and 18 inch in the rear.
While
V-twin
A V-twin engine, also called a V2 engine, is a two-cylinder piston engine where the cylinders share a common crankshaft and are arranged in a V configuration.
Although widely associated with motorcycles (installed either transversely or longit ...
s were nothing new, as
Moto Guzzi
Moto Guzzi is an Italian motorcycle manufacturer and the oldest European manufacturer in continuous motorcycle production.
Established in 1921 in Mandello del Lario, Italy, the company is noted for its historic role in Italy's motorcycling ma ...
had been mounting them with the crankshaft inline with the frame with
shaft drive
A drive shaft, driveshaft, driving shaft, tailshaft (Australian English), propeller shaft (prop shaft), or Cardan shaft (after Girolamo Cardano) is a component for transmitting mechanical power and torque and rotation, usually used to connect ...
for many years, this Honda was decidedly different. Not only was the 497 cc
engine
An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy.
Available energy sources include potential energy (e.g. energy of the Earth's gravitational field as exploited in hydroelectric power gen ...
water-cooled, but it had
four valves per
cylinder
A cylinder (from ) has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base.
A cylinder may also be defined as an infin ...
that were operated by
pushrods
A valvetrain or valve train is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. The intake valves control the flow of air/fuel mixture (or air alone for direct-injected engines) ...
rather than the
overhead cam
An overhead camshaft (OHC) engine is a piston engine where the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combustion cha ...
s favored by Honda on its previous four-stroke engine designs.
The styling was radical and upright forks and a short engine contributed to a stubby
wheelbase
In both road and rail vehicles, the wheelbase is the horizontal distance between the centers of the front and rear wheels. For road vehicles with more than two axles (e.g. some trucks), the wheelbase is the distance between the steering (front ...
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 in front and at the back.
The
fuel tank
A fuel tank (also called a petrol tank or gas tank) is a safe container for flammable fluids. Though any storage tank for fuel may be so called, the term is typically applied to part of an engine system in which the fuel is stored and propel ...
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.
CX500 Custom
![Honda CX 500 C](https://upload.wikimedia.org/wikipedia/commons/0/0b/Honda_CX_500_C.JPG)
The "Custom" variant, introduced in 1979, had a smaller, narrower tank and buckhorn handlebars. The headlight and gauges were similar to the CX500 Deluxe.
Turn signal
The lighting system of a motor vehicle consists of lighting and signalling devices mounted to or integrated into the front, rear, sides, and in some cases the top of a motor vehicle. They illuminate the road ahead for the driver and increase th ...
s were now mounted along the fork tubes, below the level of the headlight. 1982 was the last model year for the CX500. In 1983 it was bumped up to 673 cc and became the CX650. The CX650's styling was different, and the engine was painted black instead of plain aluminium.
CX500 Deluxe
The "Deluxe" model appeared in 1979. This bike looked nearly identical to the original CX500 Standard, with the exception of regular (85 mph) gauges and headlight (the mini fairing was removed) and black reversed Com Star wheels - 19 inch front and 16 inch rear. 1981 was the final year for the CX500 Deluxe model.
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 Sports
![Honda CX500 Sports 50PS 1985](https://upload.wikimedia.org/wikipedia/commons/2/2a/Honda_CX500_Sports_50PS_1985.jpg)
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 Sport (following the release of the CX650ED 'Eurosports', many people referred to the CX500EC also as the 'Eurosports' although technically not correct) features air pre-load assisted front forks with an anti-dive mechanism, known as TRAC (Torque Reactive Anti-dive Control), and an air pre-load assisted prolink mono-shock rear suspension. The wheels were also modified, with an restyled round hole comstar with a 100–90H18 front tyre, whilst on the rear is a 120–80H18. 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 Sports 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 pearl with blue and red strips, 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 late 1970s 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. Sports 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 Sports 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 400 cc version was introduced with the same styling to comply with licence rules.
GL500 Silver Wing and GL650 Silver Wing
In 1981 Honda released the GL500 Silver Wing, which was a mid-sized touring bike based on the CX500 engine. The GL500 engine was similar to the CX500 engine, but used the more reliable transistorized ignition system, which meant the stator would contain only charging windings and thus would put out more power for operating the lights and other devices commonly added to touring motorcycles. The GL500 also used Honda's Pro-Link monoshock rear suspension and was available as either a naked bike or as an Interstate model with fairing. The Interstate included a large factory fairing, hard saddlebags, and a trunk. This made the Silver Wing look like a miniature
Gold Wing GL1100 Interstate. The 1981 model had a small tail trunk, which was replaced by a larger trunk in 1982. 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. Apart from the larger engine, the GL650 had a slightly different fairing mounts and front engine hanger mount than the GL500, and portions of the GL650 engine are painted black. The fuel economy of the GL650 was improved over that of the GL500 due to significantly taller gearing and the replacement of the CX/GL500's mechanical radiator fan with an electric fan.
The CX-based Silver Wings were discontinued after the 1983 model year. Overproduction of the 1982 GL500 caused some to be sold new as late as 1984.
CX500 Turbo
![Honda CX650 Turbo 1983 Barber](https://upload.wikimedia.org/wikipedia/commons/4/4c/Honda_CX650_Turbo_1983_Barber.jpg)
The CX500 Turbo was released in 1982. The CX500 Turbo (also known as the CX500TC) was only produced for the 1982 model year. It was superseded by the CX650TD (CX650 Turbo; D=1983) for the 1983 model year, which was itself discontinued the same year. The 1982 CX500T was Honda's first production motorcycle to have
programmed fuel injection
Programmed Fuel Injection, or PGMFI/PGM-FI, is the name given by Honda to a proprietary digital electronic fuel injection system for internal combustion engines with port injection. It is available since the early 1980s. This system has been imple ...
system.
With redundant fail-safe systems working in tandem with a separate ignition system. Electronic system failures were reported to the driver through two dashboard displays: an issue with the fuel injection system would light a "Fuel System" light on the dashboard and an issue with the ignition would flash the "TURBO" indicator.
The CX500TC powerplant was based on the water-cooled V-twin with four pushrod-operated overhead valves per cylinder configuration used in the CX500 introduced a few years earlier. The engine case look was retained nearly intact from the original CX500. The turbocharger, at peak boost providing approximately 19 psi boost nearly doubles the power output of the engine. The engine case is changed to accept the larger crankshaft bearings of the CX650 released in the same year, while the suspension, brakes, frame and fairing all differ significantly from the earlier CX500 and the Pro-Link rear suspension and TRAC (Torque Reactive Anti-dive Control) were used on the CX500EC (released 1982) and CX650ED (released 1983) models.
CX650C
![1983 Honda CX650C](https://upload.wikimedia.org/wikipedia/commons/a/a0/1983_Honda_CX650C.jpg)
The CX650 Custom was a one-year model produced in 1983 for the US market. Like other CX customs, especially the CX400C designed for Asia-Pacific, this model was a cruiser. 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 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
![Honda cx 650](https://upload.wikimedia.org/wikipedia/commons/7/7d/Honda_cx_650.JPG)
The CX650ED or Eurosport was also introduced in 1983 and was cosmetically very similar to the CX500EC Sports produced the previous year. It was aimed at the UK, European, Canadian, and Australian markets. The brakes, suspension and handling were advanced in comparison to CX500 variants. The model shares many common features with the CX500TC. Tubular frame design, TRAC anti-dive forks, Pro-Link rear suspension, twin-pot brakes and disc front and back. Though this model was not sold in the US, some have been imported by private owners.
CX650T
For the 1983 model year, the engine of the CX500 Turbo was increased to 673 cc, together with an increase in power. In addition to the increase in displacement, the compression ratio was increased and the maximum boost pressure was lowered thus making for a smoother transition from off-boost to on-boost. 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 in addition to the "air" pre-load of the previous model.
Cosmetically, the CX650 Turbo differs little from its predecessor other than in colors 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. Honda built 1,777 models, with fewer than 1,200 imported to the U.S. and Canada. Only 100 units were shipped to the UK with none being exported to Australia.
In the fall of 1982, it was Honda's intent to provide a singular new CX650T to each American Honda Dealership for sale. Sales were lackluster due to the bikes high retail cost and expensive insurance rates. At years end, dealerships located in the Midwest began shipping unsold bikes to California where the bike was more popular and could be sold.
Other variants
![Honda CX Euro 400](https://upload.wikimedia.org/wikipedia/commons/8/80/Honda_CX_Euro_400.jpg)
The Japanese and European market saw 400 cc 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 674 cc engine that was used in the GL650. Also in Australia, the 1980-1982 CX500 'standard' models were known as the "CX500 Shadow".
References
{{DEFAULTSORT:Honda Cx Series
CX
Standard motorcycles
Shaft drive motorcycles
Motorcycles introduced in 1978
Motorcycles powered by V engines