Motorcycle Java 350 634: characteristics, photos and videos

The Java 350 motorcycle lineup has always been the most popular in the Soviet Union, and therefore, in 1974, engineers released another modification of the motorcycle - the Java 634. We will look at its main characteristics and advantages.

Even when the new product was released, its official name was Java 350 634/01. But the manufacturer also exported the motorcycle to other markets, and there it received the name Java 350 634/03, which distinguished it from the 01 model by engine characteristics. As a result, the Soviet modification received great demand and the Jawa plant actively refined the model over the next 9 years.

pros

• one of the best motorcycles in the USSR;
• comfortable fit for classic motorcycles;
• feels great at high speed;
• hardy;
• soft suspension.

Minuses

• too high cost;
• high price of spare parts;
• some complain about high fuel consumption.

Power

Number of cylinders 2 Number of valves Intake type Injector Carburetor Bore and stroke Starting system Electric starter, kick starter Maximum speed in km h 130 km h Cooling system Air Transmission 4-speed gearbox Clutch Dry Oil bath Drive Chain Frame Tubular steel Chassis Suspension Travel front rear Brakes Front rear Wheels Tires Rubber Dimensions and weight Dimensions Length Width Seat height Ground clearance Curb weight Wheelbase 1335 mm Weight 156 kg Fuel tank capacity 17 l. But rumors about the existence of such models as Java 360 or Java 380, if we talk about cubic capacity figures, are no more than rumors that have been circulating on the Internet since its invention.

Power transmission

In order to obtain an optimal gear ratio without excessively increasing the load on the power transmission parts, the dimensions of the drive and driven sprockets of the secondary (rear) gear have been increased to 18 and 52 teeth, respectively. The chain, now consisting of 128 links, is completely covered with a dust-proof casing, which is especially important when operating the motorcycle in rural areas.

The elastic rubber covers of the casing are filled with grease containing graphite. At the same time, they serve as very effective chain vibration dampers, which also increases its durability. New design

Zhukhov allows you to easily control the tension of the chain without disconnecting them, removing any covers, etc.

The birth of a legend The history of cz

After another 10 years, model 638 was released, differing from the previous one in appearance and increasing the voltage in the on-board network from 6 to 12 volts, a new gearbox and front fork developed by CZ. The drum brakes worked reliably, and the front and rear forks with telescopic shock absorbers ensured comfortable movement on paved roads.

Motorcycle chassis

The frame of this model is universal and made of durable components and materials. This was necessary in order for the motorcycle to work well with maximum load capacity and the installed sidecar. The telescopic fork Java 350 634 is made in such a way as to ensure confident movement not only around the city, but also in difficult terrain. Therefore, hydraulic front shock absorbers and a wheel with steel coil springs were installed.

To ensure good stability of the motorcycle on slippery roads, it was decided to install a wide rear fork support. By the way, the pendulum-type fork holds the rear wheel perfectly, which ensures traction.

Motorsports

Java motorcycles have successfully performed in sports, in particular in motocross and six-day Enduro competitions. Particularly significant successes were achieved in speedway and ice speedway. In the 60-70s of the 20th century, Java motorcycles with four-stroke engines were among the best speedway motorcycles in the world. They were attended by multiple speedway world champions Barry Briggs, Ivan Mauger, Ole Olsen and many other athletes. On Java motorcycles, Soviet and Russian racers Gabdrakhman Kadyrov, Sergei Tarabanko, Anatoly Bondarenko, Nikolai Krasnikov and others repeatedly became world champions in ice speedway. The Russian national ice speedway team continues to use Java motorcycles.

Model appearance

Outwardly, although it was relatively simple, it still attracted attention . The large headlight, with round turn signals protruding from the sides, and the dashboard wells located on top were combined very harmoniously.

And even though the wheels on the motorcycle were spoked, they sparkled very well in the sun.

The tank of the motorcycle was voluminous, but had a neat shape; in the rear there were quite large pads for the driver’s knees . But the most important thing on the tank was the inscription “Jawa”.

The 638 had a double, flat seat divided in the middle by a strap for the passenger to hold onto. glove compartments under the seat and tank on both sides .

This motorcycle received the nickname “Bench” due to the fact that under the seat there were decorative pads that stretched along the entire seat and ended with a brake light. Because of this, the seat was combined with the rear brake light.

The two-cylinder engine was completely open to view, all its components were clearly visible, although its openness played an important role - the engine was air-cooled.

The advantages of this motorcycle included a very stylish look , which Soviet motorcycles, for example, IZH products, were very far from achieving.

In addition to this, the engine was more high-speed , which made this bike unrivaled. Many also really liked the decision to launch a motorcycle.

Its gear shift foot also served as a kick starter; it was enough to press the foot a little into the gearbox housing and lift it up.

Of all the shortcomings of this motorcycle, only the shortage of spare parts . Like any other motorcycle, it could break down and parts were hard to come by.

In appearance, the ZiD Sova 200 motorcycle differed from the Voskhod in its more modern design, which could help attract Russian buyers.

A motorcycle from the Ural, which is distinguished by high power and reliability: https://themoto.net/moto/rossiyskie/ural/solo.html

New Generation. History of cz

• Small resource;
• Starting is difficult or does not start at all;
• In hot weather, it gets very hot in low gears;
• Interruptions in the operation of the cylinders;
• Knocking;
• High fuel consumption;
• There are a sufficient number of cases of inaccuracy in the manufacture of the engine crankcase at the cylinder mounting points;
• It is difficult to select timing gears to replace worn ones;
• Oil is leaking at the joints.

Similar models • From this year, the motorcycle began to enjoy success in the countries of the USSR and took its place in the motorcycle market.

Electrical equipment Java 634

This model used a 6-pole generator with a power of 75 W, and the general characteristics included a Java 634 6-volt battery ignition system. The generator itself was securely fastened to the engine crankcase. Since the Java seat was 2-seater. The battery fit freely there. The dashboard of the motorcycle was quite clear and had 4 lamps of different colors. When the generator is running, the red light goes out, when the turn is turned on, the green light flashes, when the motorcycle is set to neutral speed, the yellow light comes on, and when the high beam is on, the blue light comes on.

Safety during operation was also taken care of by installing both drum brakes with a mechanical drive. The braking process occurs in a non-standard way, because the rear brake can be activated by pressing the pedal located on the right at the bottom of the motorcycle.

Separately, we can highlight a good and comfortable seat, which will seem comfortable and soft even during long journeys. It is possible to remove the saddle. Appropriately sized compartments have been created for tools and convenient battery storage. For better safety, the seat can be locked.

The model also received some sporty details. These include sport-type footpegs and handlebars. As for the steering wheel, it has the ability to be tilted. The manufacturer tried to make the motorcycle as safe as possible, so when you turn the steering wheel all the way to the right. The steering wheel is locked with a cylinder lock.

Advantages and disadvantages

Advantages of the legendary Jawa:

• the motorcycle at one time was one of the best on the market, and even now many motorcycle enthusiasts still want to own it;
• the bike boasts a comfortable upright riding position;
• good handling at high speed;
• soft suspension providing comfort while driving on light off-road conditions.

But there are also disadvantages:

• the motorcycle is quite expensive even on the secondary market;
• a lubrication system in which engine oil is added directly to gasoline;
• high cost of maintenance due to prices for spare parts;
• high fuel consumption, which does not suit some owners of this equipment.

Java 350 - legendary Soviet motorcycle

Review of Java 634

In Soviet times, motorcycle technology was not only fast and reliable, but also universal. Java 350 type 634 was one of these models, because it had the ability to attach a rear or side trailer. It was also possible for the driver and one passenger to ride, because the carrying capacity was 180 kg. With this indicator, some owners could transport the necessary things on a trailer. Of course, the old 634 will not be able to compete with the new Ural motorcycles, but then it could surprise.