Weight and cubic capacity of the Java 350 motorcycle. Characteristics and engine power

Czech motorcyclesJawa motorcycles

There are many legendary motorcycles in the motorcycle world.

For example, in the West, one of the most legendary is Harley-Davidson.

In our country, the legacy of the Soviet motorcycle industry, which is still quite popular and, in principle, can be considered one of the legends of the motorcycle industry, is the Java motorcycle, namely the Java-350 model.

Since its appearance on the market, and this was a long time ago - in 1974, and until now - “Java” has been one of the most desirable motorcycles , along with Japanese motorcycles and their Chinese copies that have now completely filled the market.

Since the start of production, this motorcycle has undergone several modifications that have improved its technical characteristics and appearance, so we will consider the last of the Java-350 models, which had an index of 638.

This model, popularly nicknamed “Bench” because of the seat, was one of the “trump” motorcycles that roamed the roads during the Soviet Union, as well as after its collapse.

But the motorcycle production plant located in the Czechoslovak Republic went bankrupt after the collapse of the Union, and there is no such republic anymore, so the production of motorcycles of this brand almost stopped .

Java-350-638 became the last model before the end of production of this motorcycle manufacturer.

The Java-350-638 model was a classic road motorcycle. According to the current classification, it can also be classified as “naykids” .

The history of the motorcycle

The history of the legendary Soviet motorcycle began back in 1934. Then the first model appeared - Jawa 350 SV. It was a bike with a single-cylinder engine producing 12 horsepower. Its maximum speed was 100 km/h, and it weighed 125 kg. On such an iron horse, Soviet racers won international competitions.

Due to the war, Jawa production was suspended until 1948, but the new Jawa 350 Type 12 did not stay on the assembly line for long. Serial production resumed again in 1954 with the release of Java 350 354/06. From this year, the motorcycle began to enjoy success in the countries of the USSR and took its place in the motorcycle market. The bike was equipped with a two-cylinder engine with a displacement of 350 cc. cm and an air cooling system. Power increased to 16 hp, and then to 18, when new carburetors began to be installed on the motorcycle.

Jawa 350 SV-bike with single cylinder engine

The legend has been modified several times. In 1958, cone shock absorbers were replaced with piston ones. The appearance of Java at that time was considered progressive and even somewhat futuristic. By the way, it is worth remembering the famous monument to Viktor Tsoi - the famous musician sits on Java 354/06.

Tuning

Tuning cars and motorcycles is an endless construction kit for amateurs. Many people take on this kind of work, but only a few succeed. Strengthening one or another part leads to distortion in engine operation and accelerated wear of parts. As a conclusion, the best tuning would be for the Java 638 motorcycle to bring the technical characteristics to those stated in the passport. This will already be a lot.

To avoid problems with starting the engine, the carburetor is replaced with a carburetor from 634 Java. Many replacement parts are taken from the old model, but they also bring with them old defects. They install parts from Izhevsk motorcycles, but in this case they have to bore out the mounting points due to the difference in size.

The initial material should be as high as possible in terms of parameters, so it’s worth taking “Java” 638 Lux. The technical characteristics of such a device are higher and it looks more solid. In general, if you are learning how to do tuning, it is better to use such a simple and relatively cheap motorcycle. Mistakes will cost less. Be prepared that replacing the gear chain, clutch cable with a hydraulic clutch release system, or replacing the carburetor will entail other work.

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

Java Object Header Memory Model

Let's first see what is the Java object memory model? Since our virtual machines are divided into 32-bit and 64-bit, there must be differences in their models. Below I am listing 32-bit virtual machines and 64-bit virtual machines. Java Object header memory model. To

Since the author's local environment is jdk1.8, a 64-bit virtual machine, here I am using a 64-bit virtual machine (open pointer compression) for analysis because by default, jdk1.8 Pointer compression is enabled by default in 64-bit virtual machines.

The Java object header is mainly composed of two parts, the first part is Mark Word, This is also Java, an important part of the locking implementation principle, and the other part is Class Word。

Klass Word This is actually a virtual machine design oop-klass model Model here OOP Refers to Ordinary Object Pointer, it looks like the pointer is actually an object hidden in the pointer. And class contains metadata and method information for describing a Java class. It occupies 32-bit space in an environment where a compressed pointer is enabled in a 64-bit virtual machine.

Mark Word This is the subject of our analysis and relevant knowledge about locks will also be presented here. Mark Word Occupies 64-bit space in a 64-bit virtual machine environment. allMark WordThere are several distribution situations:

Unlocked (normal): Hash code (identity_hashcode) Occupies 31 bits, generation age (age) Occupies 4 bits, bias mode (biased_lock) Occupies 1 bit, lock label (lock) Occupies 2 bits, and the remaining 26 bits are not used (then have everything 0)
Biased: Thread ID takes 54 bits, epoch takes 2 bits, age takes 4 bits, biased_lock takes 1 bit, lock flag takes 2 bits, and the remaining 1 bit is unused.
Lightweight : Lock pointer takes 62 bits, lock label takes 2 bits.
Heavy Weight Locked (Heavy Weight Locked) : The lock pointer takes up 62 bits, the lock label takes up 2 bits.
GC mark : The mark bit occupies 2 bits, the rest are empty (i.e. filled with 0s)

Above is our analysis of the Java object header memory model. As long as it is a Java object, it will definitely include the object header, which means this part of the memory usage cannot be avoided. Consequently, in the environment of the author's 64-bit virtual machine and Jdk1.8 (pointer compression enabled), not a single object does anything. While a class is declared, its memory usage is at least 96 bits, that is, at least 12 bytes.

Description of Java 350

A detailed analysis of the parameters of the legendary Soviet bike will help you better understand the features of using such an iron horse.

Design

The simple design of Java was attractive with its brevity. A large headlight in combination with round turn signals looks quite harmonious. The spoked wheels sparkled beautifully in the sun, and some motorcyclists even found inspiration in this.

Appearance

Sometimes Java is called "bench". The motorcycle received this nickname due to the fact that the seat was combined with the rear brake light, and this combination really resembles a comfortable bench. According to the modern classification, the bike belongs to naked bikes - the open engine set the style, and made Java a dream for Soviet motorcycle enthusiasts on a par with IZH.

Weight and dimensions

The length of the Java is 2080 mm, width – 750 mm, height – 1070. Quite familiar dimensions for classic motorcycles with a straight seat. How much a Java 350 motorcycle weighs depends on the modification. The dry weight of the 350-634 is 160 kg. The weight of a Java 350 with a different engine may vary.

The simple design of Java was attractive with its brevity

Modifications and hybrids

Thanks to the large number of fans of the legendary motorcycle, the manufacturer continues to produce and supply iron horses to Russia.

Jawa 350 has three direct successors:

Jawa 350 Premier. A road motorcycle that is often equipped with an electric starter. The design has become more modern, but the old familiar silhouette is still noticeable.
Jawa 350 Lux. It differs from the 1991 Java in that it has a reshaped fuel tank, a digital dashboard and a plastic trunk case.
Jawa 350 Replica. With its name, this modification fully makes it clear what it is. Such motorcycles, which are produced today by a Czech manufacturer, are stylized as Soviet models. Such bikes are bought by those for whom recognition and comfort are more important than speed and power.

Photo gallery

The Java-350 motorcycle has gained considerable popularity among the people. Despite the fact that the motorcycle has not been produced for a long time, it is still in great demand, and isn’t this an indicator of reliability? The appearance of the motorcycle, at one time, met all consumer requirements; you can evaluate it in our small selection.

Technical and operational characteristics

At one time, Java simply blew up the motorcycle market, but even now this motorcycle remains relevant despite its respectful age. The Java 350, whose performance characteristics are quite modest today, still remains a relevant motorcycle.

A large headlight looks quite harmonious in combination with round turn signals

Power

The Java 350, whose engine power is 23 horsepower at 5250 rpm, is unlikely to surprise a modern motorcyclist who loves high-speed driving with such modest parameters. However, even at this, the bike is capable of reaching speeds of up to 128 km/h. How many horses there are in Java 350 also depends on the modification. For example, export models were produced only with 19 hp engines.

Dynamics

Thanks to the fact that the cylinders are now made of aluminum, the weight of the bike has decreased. The motorcycle accelerates to hundreds in about 13 seconds, but the weight of the rider is also of great importance here.

It’s a long way from a sportbike, but the purpose of the legendary Jawa is not at all high-speed riding and quick starts from a standing start.

Engine capacity

Java, whose engine capacity is only 343.37 cc. cm, it is still considered a fairly power-hungry bike.

A naked bike is a bike according to the modern classification.

Transmission

The foot-switched gearbox has 4 speeds. The drive to the rear wheel was carried out thanks to a chain.

Motor

The manufacturer is proud of the Java engine, which makes it competitive even today.

Electrical equipment

On Java 350 634 there is a 6-pole generator with a power of 75 W, which is located in the engine crankcase. This model is also equipped with a battery ignition system. The instrument panel is simple and has only 4 indicator lights. When the generator is running, the red light is on, when turning it is green, at neutral speed it is yellow, and the blue indicator is on if you turn on the high beams.

The cost of maintaining a motorcycle depends on the operating conditions.

Fuel consumption

For the Java 350, fuel consumption at a speed of 80 km/h of 4.5 liters is considered the norm. The fuel tank capacity is 17+3 liters.

Appearance

The appearance is logical and rational. Quite suitable for short trips around the city and countryside. Unlike older models, the rear light has changed, the telescopic fork of the front wheel stands out more against the general background, individual engine parts have been made more noticeable and placed closer to the exhaust pipe, the muffler has been made longer and more voluminous. Thanks to the larger muffler, engine power has increased. The mounting of the gas tank has been changed, now vibration is practically not transmitted to it.

Motorcycle lovers change the glass, install other mirrors, add or change lights, arches, seat and color, and decorative wheels.