Characteristics
YAVA 640, the technical characteristics of which are very good for Soviet times, is equipped with a two-cylinder engine with a volume of 344 cm3 . With a small volume, power characteristics are achieved by a fairly high compression ratio, almost 10 to 1. The unit is capable of reaching a maximum speed of 128 km/h with a relatively low weight of 150 kilograms.
The cooling system is quite unusual. It is provided by a separate lubrication system. Cooling mainly occurs due to the reduction of friction between parts and the removal of excess carbon deposits on the walls of the cylinders and other working elements. However, the system has its disadvantages. So, to check the oil level, you need to remove the seat and look straight into the tank.
The motorcycle is unpretentious in terms of fuel. However, it is recommended to use AI-92 gasoline and mineral oil for two-stroke engines. If operating conditions are met, you won’t even have to think about changing the oil filter.
Motorcycle Jawa 640 Style De Luxe 1999 review
Description of the motorcycle Jawa 640 Style De Luxe 1999 is in the queue for publication of the article. Announcement: Today, for almost every new motorcycle that comes into being, marketers strive to carve out their own niche. This one is a road sport, this one is a recreational enduro. But what class should we include a motorcycle that has a little bit of everything? A good bike should have a reliable engine, comfortable ergonomics and simple controls...
Jawa 640 Style De Luxe is a motorcycle not sold in Russia, equipped with a low-power 25 hp engine. Despite the fact that good models of motorcycles have a very respectable price, and the season for their use is relatively short, the motorcycle market is developing rapidly. And if you believe the words of dealers, then some models of recently released motorcycles are selling like hot cakes at the beginning of the season, and the models brought to Russia are clearly not enough to fully satisfy consumer demand.
A motorcycle has long ceased to be an alternative to a car, and the times when this equipment was bought only because there was not enough money for a full-fledged car are forgotten. Nowadays, two-wheelers can be called technological marvels in many cases, and their cost can be compared with that of prestigious cars.
Many people have started buying motorcycles for hobby purposes as riding or even collecting them has become a good pastime for many people. Many motorcycles, for example the Jawa 640 Style De Luxe, whose technical characteristics make it possible to call the model a prestigious brand, are in demand among both beginners and experienced motorcyclists.
Currently, it is impossible to purchase a new Jawa 640 Style De Luxe motorcycle from the 1999 model year, since their production stopped 17 years ago. At the same time, the Jawa 640 Style De Luxe has excellent technical characteristics, so many people strive to purchase, if not a new, then at least a used version.
Motorcycles with an engine capacity of 343 cc. see, appeared as a result of long work of inventors who sought to create a model that was not inferior in characteristics to other versions of the motorcycle. In some cases, these models are not only not inferior, but also ahead of other motorcycles, as they have minimal fuel consumption and other excellent parameters.
Motorcycles from 250 to 400 kb. see which includes the Jawa 640 Style De Luxe - this is the most common class of motorcycles. In this range you already have a choice among almost all classes of motorcycles. Many people call this category the most suitable for a first motorcycle. You can purchase a moderately heavy, powerful and flexible motorcycle for relatively little money. Many people advise taking a road bike with a 400 cc engine as your first choice. We cannot completely agree with this, because such motorcycles often weigh about 200 kg and have a sufficient power reserve. If your skills in riding a two-wheeled vehicle are limited to a training motorcycle at a motorcycle school, then you should not immediately take such a device. Many beginners get into ridiculous accidents simply because they do not know all the features of operating such equipment. After all, the heavier and more powerful the motorcycle, the better you should know how to handle it in different situations. Even a monkey can just drive in a straight line (no joke).
Go to the entire range of Jawa motorcycles, on this page you can find Jawa 640 Style De Luxe motorcycles from other years of production and information about them
Peculiarities
A lot of time has passed since Soviet times, during which the bikes were repeatedly modified and improved. The new models, which are modifications of older units, have received a number of features:
- In the 70s, they didn’t think much about the aesthetics of such little things as the sound emanating from the engine or muffler. However, at the moment, not everyone wants to buy a bike that produces more noise than power. On new modifications of YAVA motorcycles, sports mufflers began to be installed. They significantly reduce the sound produced and dampen unnecessary vibrations.
- The front wheel brake has undergone excellent improvements. It is a hydraulic disc with a diameter of 265 mm. This modification makes it easier to control the motorcycle and provides smooth, even braking.
- The frame of the unit has become quite heavy. It was not previously known for its lightness, but the reinforced steel alloy adds more than just strength to the frame. The increase in weight helps the bike balance on the road, which in turn improves stability in corners and over bumps.
- Some models, such as the Premier, allow you to install additional equipment. For example, a stroller for passengers or boxes on the sides of a motorcycle for transporting small loads.
- The bike is equipped with a contactless ignition system and a flywheel generator. They simplify the electrical wiring system.
- The switching feature has been preserved since Soviet times. Triggering the kickdown makes it easier for the engine to adapt to the gearbox stage. This is ensured by a high level of revolutions and maximum engine torque.
- A relatively recent solution has been the use of a semi-automatic clutch on new models. It's not original, but it's very convenient. It allows you to start and shift without using the steering lever.
It is quite difficult to single out specific shortcomings in a motorcycle. However, such a defect as the lack of an electric starter sometimes greatly upsets owners.
JAWA 640 can be an excellent companion for rural youth due to its excellent cross-country ability and the ability to board passengers. The price for such a device from official dealers will be about 80-120 thousand rubles, depending on the configuration of the motorcycle.
content .. 1 2 3 5 ..Motorcycle engine Java-638, Java-639, Java-640
Before dismantling, you must first unscrew the carburetor flange, which is common to both cylinders. Turn on and number 8 M 10 pipe impact wrench, loosen the cylinder head and remove it. Pootáčíme the engine so that the piston of the cylinder that we removed was at the bottom/below/dead center. Then remove the cylinder. Once the cylinder is removed, the holes are created safe from the intrusion of contaminants. Installation is in the reverse order. Before removing the clean surface of the cylinders and engine hood. The working area is cleaned with oiled rollers and placed on the piston. During installation, we proceed carefully, making sure that the piston rings are installed correctly in the locks and to avoid damage. Cylinder head inserts / only if damaged / new seals. Tighten the nuts of the head bolts crosswise, using a wrench force of 17.6 Nm. In case of dismantling the cylinder head and cylinders while the engine is running in the frame, you must first remove the seat and tank, disconnect the exhaust elbows and fold them, remove the reel with cables and connectors.
Pistons - disassembly, assembly
First Second Pistons - Dismantling and installation
The piston pin is stored in a roller bearing without a cage. For these reasons, we do not recommend removing pistons without special tools. During disassembly it may cause some needles to get into the engine and the engine must be disassembled and the sunken needles removed. We recommend the following: After removing the cylinder / see chapter One 1st / seal the hole in the crankcase. Seize the piston rings with pliers and remove the corresponding piston fuse contacts. Find the auxiliary piston S-88 already inserted into the hole and the insertion of the contact vylisovací S-87, which push up the walls. Attach to the work table. Remove the rods of the upper eye and insert the auxiliary S-88, which remained in the needle eye of the rods, providing, including the original rings, the distance for the needles from falling out. Before installing the pistons, make sure the mesh at the top of the rod is inserted with needle rollers/28pcs for the rod/ring and spacer. Inside the cylinder should be placed in the auxiliary insert S-88. On the upper connecting rod, rotate the piston smoothly to avoid the spacer rings and rollers falling on the engine body.
The piston must be marked L or P / L-left, right P-/ for one cylinder and the boom must be ready forward to the exhaust ports. By pressing the pin, the piston pin vylisovacího again use S-87. During installation, you must ensure that the illuminated bores and piston pins point to the outside of the engine. The piston pins provide safety features. Before installing new pistons, find out whether they have adequate separation, that is, A, B or C in connection with the individual cylinders. To make sure that the piston in the cylinder is displaced before installing the piston ring: there is no ring on the piston, first put it on the piston and turn the trigger mechanism into a crank lever, check the piston at top dead center on both sides of the same will. In that case, one side of the war remains pressed and even moved, when it returns to the same side, you must remove the cylinder and the rod carefully take a sip on the opposite side. This operation is called úhlování rods. The right piston vyúhlované rods must have the same controls on both sides.
Primary clutch disc - removal First Third Primary disc - clutch - removal
O P O R:
Performed after draining the oil from the gearbox. Put on the starter lever / pre-rotating to its original position / and unscrew the screws securing the left engine cover. After removing the cover, unscrew the 5 M 6 screws and release the pressure in the spring. Then slide out the inner clutch basket with the blade support. Loosen the washers and use an S 91 adjustable wrench No. 19, enable the basket securing nut to the main shaft and remove the driver. Use the product with 94 and No. 27 keys, allowing the primary wheel nuts. puller S-85 wheel and pull out the main clutch basket along with the chain and remove it from the shaft. In most cases, it is possible to remove the clutch basket without loading the main sprocket and the clutch basket several times to move the main shaft, so we can povysunout the clutch wheel spacers. Povysunutou Spacer for collection and disposal. After this you can take out the trash.
Primary clutch disc - installation
First Third First assembly
Clean, dry cone Place the crankshaft sprocket and mainly on the main shaft gear Slide pad Spacer / proměříme runout before installing the duty spacer / pre-clutch sprocket. The steel ruler is attached to the sides of the gear wheels in place, making sure the wheels are in the same plane, allowing displacement tolerance of 0.5 mm, which is very important for the life of the main chain and the noise of the main gear. Any deviations are removed from the soft clutch wheel; steel washers of appropriate thickness are inserted between the main shaft bearings and the washer. After checking the parallelism, the wheel slip clutch again. Before installation, check the starter ring system condition of the shaft seal. Mount the starter gears, shafts and rotate to the starting position. Install the main chain and gears at the same time we install the crankshaft taper and input shaft. Install the inner support clutch main shaft with the rubber ring and washer attached intact. Carrier secure nuts and washers provided. Tighten the primary sprocket onto the crankshaft. In these works the use of S-91.
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Motorcycle Java 640
Hello! The domestic information resource “Everything about Moto” guarantees that you will be interested in the information on the site. We will tell you about the most beautiful and powerful iron horses. In addition, from these pages you will learn about domestic and world bikers, and you will be able to study questions regarding motorcycle tuning. Other types of data are also available.
Model Jawa 640
The Java 350 640 motorcycle was produced for only a couple of years in the mid-1990s. Yet, in this short period of time, the Czechoslovak manufacturer was able to provide many copies of practically modern bikes to the markets of post-Soviet countries. The above bike has many advantages. It has a powerful modernized two-cylinder 350 cc engine. This iron horse is well known to our motorcycle enthusiasts due to its beautiful aesthetic appearance.
Many years of successful operation of two-wheeled motorcycles on our land allowed it to win the hearts of Russian, Ukrainian and Belarusian motorcycle enthusiasts. In addition to respect and high popularity, this bike should be proud of its speed performance, as well as ergonomics.
The Java 350 640 motorcycle in its basic design has spoked wheels and a front disc brake. Finally, a motorcycle manufacturer from Czechoslovakia, following the Soviet designers, has modernized the braking system on its products. We also note the presence of a successful small semi-fairing with a rectangular headlight on the Jawa 640 bike.
There are many models of the above series, each of which has certain features. For example, the Java “Sidecar” was created with a side stroller of the “Velorex 700” type specifically for use for household purposes.
The designers dressed the “640th” model, called “Sport,” in a fashionable and highly functional plastic fairing (“Grand Prix”). The above vehicles also have cast wheels with mufflers for a sporty design.
The Jawa 350 640 “Police” was also equipped with the same fairing. This iron horse was produced by the emergency manufacturer specifically for police service. The Java 350 640 “Chopper” motorcycle was created without fairings. It was equipped with a stepped saddle with a comfortable passenger backrest, as well as a high handlebar. In addition, the bike received a chrome-plated muffler from the designers of the Czech plant.
The Tramp bike from Jawa was styled in the spirit of enduro. He was also shod in tires with developed lugs.
