Honda CB 750 Furnace

The Honda CB 750 Furnace is a model of Motocyclette produces starting from 1968, and which marks, for the majority of the observers, the passage to the era of the modern motor bike.

A little history

At the end of the XIXe century, the motor cycle is born, in the form of a Bicyclette motorized (of other forms, as the Moteur S auxiliaries for bicycles will be tested).

The practice of the motor bike, at that time, concerns the course of the combatant:

component engine with the free air, sprinkling Oil all the environment, of which the pilot
delicate Starting
Brake S symbolic systems or non-existent
comfort and Handling embryonic
rudimentary reliability
important maintenance
etc

At that time, the motor cycle is especially intended for professional uses: Army, etc

Helping progress, the motor bike improves, but preserves its simple origins. It becomes the car the poor one.

After the Second world war, the industrial merger makes disappear the majority from the manufacturers of motor bikes.

The principal surviving marks are British (Norton, Triumph), German are (BMW, especially confined in the top-of-the-range utility), Italy (Moto Guzzi, Ducati) or American (Harley-Davidson). The France remains a manufacturer of utilities of small Cylindrée (Motobécane, Vélosolex, Peugeot).

At the beginning of the Years 1960, the Japan board, which were interested in the motor bike after the war, arrive in Occident with a financial and technological power impressive. They start by sitting their notoriety by the competition, engaging of the models very sophisticated in the races on track: two Cylinder S for one 50 cm, five for one 125, six for one 250, the whole with 4 Valve S by cylinder, Double camshaft at the head, and distracting Mode S (up to 18.000 tr/min).

Towards 1965, Japanese thus finds a favorable ground in Europe and with the the United States:

the European manufacturers almost disappeared;
they have a good notoriety (they gained all the championships almost);
they understood that the Westerners are ready to buy motor cycles again, for little that they allure them.

The four Japanese famous brands leave the models small to rolled average, which give wire already well to retordre with the British, of much big-engined car.

The first clap of thunder comes in 1965, when Honda leaves CB 450, double ACT, electric Démarreur, 170 km/h.

As of this moment, the race with the improvements and the power is committed among Japanese, with 4-stroke engines at Honda, and two times at the others.

Whereas the market is directed in the East, Honda leaves, in 1969, the motor bike which will mark its century: 750 to four cylinders.

Advantages and disadvantages of the 750 Furnace

None the characteristics of Honda 750 is single:

4 cylinders: there is of it since 1903 (FN)
simple Camshaft at the head
67 horses (Kawasaki 500 H1 in has almost as much)
4 Carburateur S
Electric starter
Allumage battery - winds
front brake with disc hydraulic, back with drum
suspension with telescopic Fourche hydraulic with before and oscillating Bras with the back
190 km/h

Apart from the hydraulic disc brake, revolution for the time (many pilots of competition will mount on their motor bike a brake of origin of 750 Honda of tourism, like Christian Ravel, on its Kawasaki H 1R), the other characteristics are known.

Then, why Honda 750 have will such a prestige?

Probably because it is the first time that as many qualities is joined together on the same motor bike: a motor bike able to go up to almost 200 km/h, but easy to start, without excessive vibrations, clean, with equipment of quality (Meter S, Flickering S, Control unit S, etc), an irreproachable completion, an attractive esthetics, Chromium S of quality, a powerful and complete electric system, Rear view mirror S usable, etc

Contrary to two Japanese times, the four legs does not smoke, does not roast its candles with all the corners of street, does not absorb its tank between two service stations, in short, it remains usable.

Moreover, the Marketing will do its work well, for example by imposing four exhausts separated for marking well the difference with the other motor bikes in its time.

However, it has also disadvantages. A hesitant handling, a braking well in-on this side current standards (but the best of the time), a lighting faiblard, unnamable tires of origin, a fragile chain of transmission secondary, etc

But, basic qualities of this motor bike - esthetics between other place it so much above the others that the accessories suppliers will precipitate to give him missing qualities: Tire S Europeans, Headlight S with Iodine, second disc brake with before (the fork is designed to accommodate a second disc without modification), kits chains duplex, etc

Certain workshops, like Japauto, will market kits 900 cm, and will make a misfortune in competition (endurance).

Four years will have to be waited, with the Kawasaki 900 Z1 to see on our roads a more prestigious machine.

Models

1969: K0. Recognizable with its carburettors supplied with 4 independent cables, power of 67ch
1970: K1. The side masks raise initials '750 Furnace

1972; K2. The legs of headlight become chrome, the power goes down to 65ch

Modèles K3 in K5: minor modifications, not imported into France

1975: K6. Always in the line of original of 1969 but power still in fall: 63ch

1975: F1. Large recasting with an exhaust 4 in 1. The back drum brake is replaced by a disc 267 mms in diameter, gripped by a clamp monopiston. The pistons and the camshafts are replaced, the power returns to that of origin is 67ch with 9.000 rpm. The couple is him also improved, it climbs with 6,4 mkg.

1977: K7. Replacing of K6. Four exhausts of a new model.

1977: F2. Replacing of F1. The engine becomes black, the power climbs with 73ch thanks to a more pointed camshaft and larger valves, the wheels with branches and the disc brake becomes double with front, but loses 25 mms in diameter.

750 Furnace today

Although technically exceeded, the Four Legs remains a sure value. The readers of the Moto magazine Captions elected it Moto of the Century.

Impassioned and the collectors continue to make live this model, which keeps a large dimension, for little that it is in country of origin.

External bonds

a site on the 4 legs
the friendly one of Honda CB and Furnace
Film on the 4 legs

Random links: