Tuning Izh Jupiter 5 - detailed instructions for modernization

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IZH Jupiter 5 is a legend of the Soviet motorcycle industry. A popular model among all ages from young to old. With high technical and driving parameters. The engine power is 25 horsepower, the highest speed is 140 kilometers per hour, this bike first rolled off the assembly line in 1985.

The owners of such a two-wheeled horse strive to fully upgrade their motorcycle. Its cost in the native market ranges from 650 to 700 dollars. IZH Jupiter 5 is simply created for tuning. But it makes sense to bring it to mind first with its appearance.

Silencing attachment

You can make such an attachment from the old muffler of the “fifth” or “fourth” “Jupiter” or the “fourth” - “third” “Planet”.
A cylindrical piece without partitions should be used to make the nozzle. The “flute” must be made of a heat-resistant material; the muffler connecting pipe from the Ural motorcycle may be suitable for this. Holes will need to be drilled in it, and the free space between the body and the tube should be filled with glass wool. The exhaust pipe can be left original. It should only be shortened a little and the connection should be welded rather than bolted.

The next step will be to improve the intake system. The minimum program would be to install a carburetor from the Planet-5 motorcycle, where the diffuser diameter is 32mm. To do this, it is necessary to cut the inlet windows in the pipe flange and cylinders a little. To significantly increase acceleration dynamics with simultaneous synchronous operation of the cylinders, two carburetors will be needed.

On foreign-made motorcycles, a carburetor for each cylinder has been installed for a long time and has become the norm. From the standard pipe you will need flanges with which to attach to the cylinders. In addition, it will be necessary to machine two aluminum bushings, and the carburetor mounting flange will need to be cut off from the Planeta inlet pipe.

The second flange can be taken from the old “Jupiter” carburetor. Welding of parts must be done with argon, after which the assembly must be adjusted until the gaps completely match. If small gaps have formed, they can be filled with epoxy or “cold welding”. When using epoxy glue, you can use aluminum filings or powder as a filler.

To ensure uniform traction up to acceleration of 100 km/h, use the K 65V from the Voskhod motorcycle. It is advisable to replace the main fuel jets, needles and nozzles; repair kits for these carburetors are relatively inexpensive on the market. The fuel level in the float chamber can be left the same. Having completed the carburetor, you can begin upgrading the air filter.

The original air filter installed on a motorcycle is not only unable to provide high-quality air purification, but also reduces engine power. In this case, you can buy an imported filter or use the upper part of the foam filter for the Voskhod motorcycle, which can cope with both installed carburetors, besides, it takes up little space and is very easy to maintain. Impregnation of foam rubber should be done with special oil for air filters. Getting such oil will not be difficult.

One of the most important jobs remains - finishing the cylinders and piston group. The engine from Jupiter-5 is more mature, so there will be much less fuss with it. In the figure, the red lines refer to the development of the modified “Sport” cylinders, the black lines show the standard “Classic” version. An increase in engine power can be achieved by trimming the upper edge of the exhaust window by 1.5-2mm.

To increase the power of the Yu-5 engine by increasing the speed, trim the upper edge of the exhaust window by 1.5-2 mm. A prerequisite is the same weight of the pistons, and the windows must coincide with the purge windows in the cylinders and in no case overlap them. The edges of the piston rings will need to be chamfered.

It will be necessary to lighten the piston pins by cutting them into a cone at the end. It is also necessary to chamfer the end of the fingers. The “tails” of the locking pins will need to be bitten off so that they are not cut off by the piston pin.

For further refinement, you will need to find a crankshaft that has a needle bearing in the upper part. Such a shaft can be found on the “liquid” Jupiter. This shaft is interchangeable with other models. To ensure better lubrication of the bearing, it will be necessary to drill two holes in the head, the diameter of which should be in the range of 3-3.5 mm, as is done on the Planet. As practice shows, standard aluminum separators installed at the factory are not reliable.

The cylinder heads will need to be tightened by cutting their ends on a lathe. The volume of the combustion chamber can be determined by the spill method; it should be within 19 cm3. It is not recommended to increase the compression ratio further, since the cylinder heads may lose rigidity. After all the modifications made, you will have to drive the AI-92. At the end, you will need to adjust the ignition angle and install new Brisk OT “Jawa” or PAL spark plugs.

Improved technical characteristics

Engine

The Planet-5 engine is convenient for processing. Of course, owners always want to increase power. To do this, it is worth repressing the crankshaft, replacing the original bearings with bearings from the Java secondary shaft.

When disassembling, it is worth silvering the upper ring and the lower separator. After tuning the engine, its service life is reduced. So if you use the motorcycle for normal speed riding, you should not change anything in the engine, as this will greatly reduce the life of the tires

and rear clutch.

Cylinder

To increase the volume of the cylinder, cut off its upper part and bore the liner to 76 mm. After pumping the engine, the Planet can accelerate to 160 km/h.

Clutch

The factory clutch of the IZH Planet-5 copes well with normal loads. If you drive a lot and drive aggressively, you should think about replacing the clutch. Under increased load, the disks quickly fail, so it is worth replacing one of them with a thicker metal one. This will lead to a stronger compression of the springs, in which there will be no slipping and the clutch will be more difficult to squeeze.

Supercharging

Advanced mechanics can change the boost system. When tuning the IZH Planet motorcycle, do not forget to replace the air filter with a foreign one. High-quality air purification will increase the power of your “iron horse” and prevent the engine from overheating.

Piston

Lubricating the piston will increase friction between the side wall and the cylinder bore.

Thus, after spending some time and money on tuning the IZH Planet-5 motorcycle, you will get an excellent “iron friend”. "Planet" initially has good technical characteristics - excellent traction, high power, resistance to any type of road.

Add to this an affordable price, ease of maintenance and availability of the necessary parts, plus your skills and imagination - and you will get a motorcycle that will serve you faithfully in Russian off-road conditions for many years.

In addition to its decent appearance, Izh Planet 5 has excellent technical characteristics. The motorcycle is equipped with a single-cylinder two-stroke engine with a power of 22 hp. With. The fuel consumption and processing system requires a modest 5 liters. gasoline with stable driving at a speed of 90 km/h. In addition, this model of domestic motorcycle was one of the first to receive an air cooling system, which increases traction at low speeds.

The maximum speed of the motorcycle is 120 km/h. The unit performs well when driving off-road and does not require large expenses for maintenance. All this is the reason for the wild popularity of Izh Planet 5 from 1987 to the present day. After all, not every one of us can buy an expensive Harley Davidson. But many people are capable of paying 5–6 thousand rubles for a domestic motorcycle. In addition, the Izhevsk Machine Plant model is much easier to tune with your own hands, which cannot be said about the expensive American and Japanese “monsters”.

The principle of operation of the muffler

After fuel combustion in a small chamber, the gases have enormous energy and escape at high speed from the cylinder pipe into the pipe and then into the muffler. This is accompanied by a lot of noise. After passing through the labyrinths of the silencer, the energy wastes its strength. This causes all exhaust parts to heat up. This system not only performs the work of removing gases. By selecting the size and geometry of the muffler pipe, you can achieve fuel savings and increase the power of a two-stroke engine. The picture of the layout shows which part is responsible for what.

Engine tuning

The two-cylinder two-stroke engine with a working volume of 347.6 cubic meters was installed on the motorcycle. see most often has air cooling. The number of models released in recent years of production that used liquid cooling is negligible. The power that the engine develops is 24 hp. With. – can be increased by making some simple modifications:

Increase the compression ratio by removing about 1.5 mm from the adjacent plane of the block head. But this will require switching to fuel with an octane rating of AI-95 and making changes to the design of the crank mechanism. First of all, replacing the crankshaft bearings. You will also have to select spark plugs with a different heat rating.
Replacing crankshaft bearings. There is an opinion that only high-quality imported bearings can cope with increased loads. In fact, domestic developers have installed bearings with a large margin of safety. If you manage to purchase high-quality Russian analogues, they will do the job perfectly. Trying to change the size of the crankshaft journals is simply harmful. The thickness of their hardening layer is small and when more than 1 mm is removed from the surface of the journal, the service life of the part will sharply decrease.
Replacement or modification of pistons. The stock parts aren't that bad. Don't rush to look for a replacement for them. To increase power, it will be enough to lighten the pistons by removing casting flash and excess material from them. Parts should be carefully adjusted according to weight. It is desirable that the difference does not exceed hundredths of a gram. Such simple engine tuning will be more effective than installing a zero-resistance air filter or a direct-flow muffler. Although it is, of course, possible to install forward flow on IZ Jupiter-5.
Installing another carburetor. If possible, it's worth shelling out for a good Mikuni carburetor. Don't go for a large diffuser size. The standard diameter of 32 mm will be quite sufficient. But it’s definitely worth removing the protrusions on the intake and exhaust manifolds and polishing the internal channels of these parts. This will not only provide an increase in power, but will also help reduce fuel consumption below five liters.
Replacement of the ignition system. Installing BSZ on IZ Jupiter-5 only makes sense if you intend to use imported components. Most likely, the quality of domestic components will reduce all the advantages of the contactless ignition system to zero and the rework will not give the desired result.

Do not forget that increased power will improve the acceleration dynamics of the motorcycle, but will not provide a significant increase in speed. To increase speed, you will have to change the transmission gear ratios, selecting different sprockets for the gearbox and rear wheel.

Motorcycle "Planet-5"

The Planet-5 motorcycle, production of which began in 1985 and was completed in 2008, is remarkably amenable to tuning. More often they carry out tuning of the exterior, some units or main components. To make the fifth “Planet” more playful and passable (in fact, convert the IZH “Planet-5” into a cross-country motorcycle), they remove excess from the frame in order to reduce the 180-kilogram weight of the motorcycle when it is loaded. Then, for better ride, long-stroke shock absorbers are installed on the rear wheel and the front fork is replaced. You can rearrange it from a Java motorcycle with increased speed. Naturally, the wings are also changed.

There are no major changes to the engine. To increase the service life of the crankshaft, replace the original bearings from the secondary shaft with “Java” ones. The quality and increased service life compensate for the high cost of these bearings.

For the IZH Planet-5 motorcycle, engine tuning also means increasing the cylinder volume. To do this, the top is cut off and the sleeve is bored to 76 millimeters. A piston from Planet-Sport will fit freely under this size. After these modifications, the prototype of the modernized Planet 5 will reach a speed of up to 160 kilometers instead of its 120 kilometers per hour. By the way, on the test bench the engine developed a power of 42 hp. at 5950 rpm. But with any boost of the engine, its resource is reduced. Such modifications should not be made on a motorcycle intended for everyday normal riding.

When boosting the engine, the standard rear tires, clutch and chain may not last long. We need to think about their modernization.

Drawing of a resonator for Izh Jupiter/Planet motorcycles

(Jupiter is the average size, for the planet it is the maximum)

I read earlier on the Internet that the resonator for the P5 engine (one-pipe design) is very long and awkward.

Today at work during a smoke break I came across a program for Android (I use a tablet) to calculate the resonator for a 2T motor. The program contains four calculation methods - Grigoriev, Voitenko, Blair and complex. I calculated using a complex method.

I’ll say right away that the calculation is carried out according to the purge and exhaust phases. I have modified, seriously modified valve timing; these drawings will not work at all on a stock engine.

I wanted something like this: a resonator, but of short length, and maximum output at low speeds (3-4.5 thousand) because installing a huge pipe doesn’t fit the style, I don’t want to run it under the frame; I plan to use it not only on asphalt. I will say that my wishes regarding the short exhaust were dashed by calculations.

The main calculation for my engine is for 3 thousand revolutions. For 4 thousand I'll throw it lower

The resonator is calculated to add 8-17% power (compared to a standard exhaust). With the current configuration, the piston configuration produces 32 hp without a resonator and 34.5-38 hp with a resonator.

Help. What to do. The length of 2 meters does not suit me (counting is from the mirror of the cylinder). For reference, the standard length is 20 cm less. Optimal - 120-160 cm. The long exhaust kills the entire appearance. Can you tell me how and where to hide it?

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Comments

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Rechitsa

I came across this post by accident. It's nice that someone is using my program. And yes, indeed, the lower the calculated speed, the longer the silencer is. And this is the real problem. I thought in reality that I wanted to get the engine to run efficiently at 4500 rpm. But the length is too long. But everywhere they recommend calculating the cutter at the speed at which the engine produces maximum power, and on my Java it’s 5200. Although I’m not sure I’m spinning that much. But when calculating for 5200, the length turns out to be at least sane. In your case, you can do as the guys in this video vk.com/rezkit?w=wall-32646518_202%2Fall Screw the resonator into a ram's horn. It will be more difficult to make, of course, but this is a compromise. If you think about it, you can do it beautifully.

SaviorBlack

Russia, Krasnodar

The program is really interesting. Partially helped in understanding and small calculations. But for the motor, not a classic half-wave resonator was made, but a quarter-wave one. The twist into the ram's horn did not suit me. I calculated it myself according to Blair, and made the sound dampening system ala “LeoVinci”. It is in subsequent posts)

Cafe Racer

The style largely repeats the previous one, because it consists of giving the motorcycle an appearance similar to the British models of the 60-70s. A distinctive feature of such motorcycles is the special shape of the seat and tail. For our modification model, we will have to work on the rear part and replace the tank with a more streamlined one. You will also have to change a number of details in general, these are:

round mirrors;
one round device instead of a panel;
monochrome, dim color of the main elements;
no stickers;
an abundance of chrome parts (switch feet, turn signals, possibly fenders).

In what cases is ignition adjustment necessary?

During the operation of the vehicle, the owner faces many problems. The most serious failure is related to the engine. In order to spend significant funds on major repairs, it is necessary to monitor the technical condition of the motorcycle and carry out preventive work, including adjusting the valves and valves (video author - Hana Rulyu).

If you do not monitor the SZ, then the motorcycle engine may not reveal its full potential and will not work at full capacity. This can lead to a reduction in its service life. An ignition adjustment is necessary if the engine is running poorly, the muffler or carburetor is firing. True, before setting up the SZ, you should make sure that the cause of the malfunction is in it.

It happens that the flywheel bolt, which connects the two halves of the crankshaft, comes loose, begins to play and does not work well. Sometimes he even cuts the key.

Setting up the SZ may be necessary after repairing the ignition switch Izh Jupiter 5. The installation and connection itself are carried out according to the diagram.

SZ diagram of the IZh motorcycle

Refinement and modification of suspension

The original suspension of the IZH Jupiter-5 motorcycle is reliable and has good maintainability. It is not difficult to restore it, but better results can be obtained by making some changes to the design.

Installation of adjustable gas shock absorbers. Today on sale it is not difficult to find gas shock absorbers with suitable parameters that can be used in the design of the rear suspension for tuning IZ Jupiter-5. Ideally, you can improve ride comfort and improve the stability of the car on the highway.

Replacing the front fork. This is also possible, but most likely will require reworking its fastening.

Installing another handlebar is not prohibited if it does not worsen the ergonomics of the rider's seat.

How I decided to remove paint

It was necessary to have some kind of more or less durable grinder with an attachment made of Scotch Brite of suitable grain size, with Velcro on a cup with a rubber base. The surface would immediately be obtained without unnecessary scratches (although traces of metal molding and roughly cleaned welds previously hidden under paint would be visible).

Here, for example, are traces of metal molding:

Plus, the welds would have to be cleaned with a brush made of thin steel wires - also an angle grinder or a light high-speed reversible drill with such an attachment.

But instead of a so-so drill (and this is my drill in the photo and screws screws) with the money I had, I bought a semi-professional Skil grinder with a flexible shaft for 1390 rubles (790 rubles in the configuration without a flexible shaft; the flexible shaft resembles a speedometer cable in braid), I didn’t really use a single attachment from it. I asked him to sharpen an M6 bolt for a 3.2 mm collet, sawed it at the end and put small strips of sandpaper there.

This device made it possible to remove paint from the wheel rim without disassembling the wheel (without separating the rim and the wheel hub).

By the way, never clamp Chinese 3.0 mm bits with such a collet - they will turn and you will have to buy a whole set of collets (they are for different drills) in a radio parts store, which costs 200 rubles. Probably, the collet is 3.00 mm and not 3.20 mm and you need to clamp such attachments.

Included with the grinder was a pencil-shaped attachment made of diamond-coated steel. She was able to trim welds and draw on glass jars (the part with the largest diameter). These are sold in separate sets, but it’s still a shame to trim the metal with them.

You have to add machine oil to the flexible shaft of the grinder - in the place where it connects to the grinder, it then leaks out and ends up everywhere - on the floor, mask, face and clothes. It is better not to set the speed above positions 3, 4 or 5 during different operations set by the speed controller (there are 6 positions in total), since the motor in it starts to heat up too quickly at high speeds, the smell of insulation appears and you feel sorry for the sander.

Almost all the paint and rust was removed from the motorcycle with this sander. A grinder in addition to a grinder like this would be much faster, perhaps two or three days for all the parts including the frame. Some parts were cleaned by hand. It’s more pleasant to work by hand; there’s no rush like with a power tool. I would have done exactly this without a sander.

The best thing is a durable air compressor with sufficient liters per minute and air pressure capacity, and a few tools to go with it (a durable straight sander with easily replaceable bearings and a small angle sander with a rubber backing for Velcro). The rotation of the attachments in such tools simply stops and they do not get knocked out of your hands like a power tool - which often has a kilowatt of power to withstand possible overheating from prolonged use.

Silencing attachment

Holes will need to be drilled in it, and the free space between the body and the tube should be filled with glass wool. The exhaust pipe can be left original. It should only be shortened a little and the connection should be welded rather than bolted.

Muffler cleaning methods

The exhaust system has no adjustments, therefore, it is necessary to clean it in a timely manner.

Filters that dampen sound must be removed and burned. You can do it over a fire or use a blowtorch. Cool quickly using cold water. This leads to carbon deposits peeling off. Clean the pipe with a metal brush.

The next method is to burn off the carbon deposits and remaining fuel inside. Let's place the pipe vertically, you need to set it on fire from below, a draft will appear and all the carbon inside will burn out. All that remains is to remove the combustion residues.

A gentle way to clean. Use a chemical solution to soften deposits. The solution is prepared for a liter of water, 25 grams of caustic soda, 33 grams of carbonic soda, 8.5 grams of soap. Heat the solution strongly until almost boiling. Pour it inside the muffler and wait a couple of hours. After this, rinse thoroughly with warm water.

Source

Engine tuning Izh Jupiter 5

Many Jupiter owners are not satisfied with the power of their motorcycle. In this part of the article we will look at Jupiter 5 engine tuning. In fact, the Izha engine has great potential for increasing power. First, make sure that the engine is in more or less normal condition, the cylinder fins are intact, and the bearing seats in the crankcase are not broken. First of all, tuning of this model is to eliminate the “jambs” from the poor quality of production of parts of the serial industry of past years, since at that time they tried to reduce the cost of production as much as possible. Don't forget to clean the engine before disassembling. Having disassembled the engine, we advise you to replace all the bearings with European or Japanese analogues, because after tuning the Izh motorcycle, the speed will increase and the loads will increase. If the gaps between the pistons and the cylinder do not meet the standard, you will need to bore to the nearest repair size. Then we proceed to processing the purge channels. As a rule, these are steps at the joints between the bottom of the cylinder and the surface of the crankcase.

They create resistance and unnecessary swirl of the fuel mixture, which reduces the flow rate and prevents you from getting maximum power from the engine. This can be done using cutters and a drill.

After this, you need to smooth out any remaining unevenness with sandpaper. Also use sandpaper to sand the inlet and outlet channels in the cylinders, smoothing out any unevenness from the casting. Moreover, it is enough to process the inlet channel to a smooth rough surface, and the exhaust channel to the smoothest possible state for better movement of exhaust gases and to prevent carbon deposits. The bottom and surface of the pistons must similarly be polished to a shine. To increase the compression ratio, Jupiter cylinder heads need to be trimmed by 1.5-2mm to reduce the combustion chambers. This is done on a lathe, the heads are mounted in the chuck using mandrels

It is important to ensure the same surface treatment - the volume of both combustion chambers must be strictly the same. Increasing the compression ratio will entail a transition to 95th gasoline, and the ignition is set a few degrees earlier

It is highly recommended to replace the old contact ignition with an electronic one with automatic advance. It will allow you to achieve high speeds and spark at the right time. If desired, you can assemble the new ignition yourself. The crankshaft also needs to be modified. The standard crankshaft is too heavy and is designed to be ridden with a sidecar and a loaded motorcycle. You will have to unpress it, and grind the outer diameter of the cheeks to 125 mm in diameter, then polish the connecting rods to a mirror surface. The modified crankshaft is subject to assembly and mandatory balancing. This tuning of Izh Jupiter 5 will allow it to accelerate to 160 km/h.

Pipes, muffler for motorcycles IZH Jupiter, Planet 5

The engine of IZH motorcycles is two-stroke, so the fuel combustion process is noisier than a four-stroke engine, and a larger amount of unburned gases is also released into the atmosphere. At the moment of release, the exhaust gases have a high temperature that is dangerous to the health of the motorcyclist. Therefore, the IL muffler pipes must have a more complex design. Comply with safety standards and not cause harm to human health and the environment.

Electrical equipment IZH Planet 5

The motorcycle uses 12-volt electrical equipment. The electrical wiring of the IZH Planet 5 motorcycle is single-wire, the role of the negative wire is performed by a metal frame.

Among the main components are:

Power supplies;
Ignition system;
Headlight;
Side lighting and turns.

Generator

The motorcycle is equipped with a three-phase alternating current generator with an electromagnetic excitation circuit.

The principle of its operation is as follows:

Electric current from the windings located on the stator is supplied to the rectifier;
It converts it to direct current;
And supplies it to consumers through the ignition switch.

The instructions provided include the following items:

Voltage regulator with rectifier BPV-14-10;
Generator rotor;
Generator stator with windings;
Current collector brushes;
Ignition system cam (battery);
Ignition system contact unit

Headlight

Unlike European countries, where there is a requirement that motorcycles with permanent magnet generators must be equipped with a battery - since a motorcycle with a non-working engine must have side lights - there are no such restrictions in Russia (see also about the Ural motorcycle wiring diagram).

The head light circuit includes:

headlight lamp (35W);
blue indicator lamp (2W);
headlight parking light (4W);
rear brake light lamp (15W).

Control devices

The following control devices are installed on the motorcycle:

speedometer with daily and total mileage counters;
tachometer with indicator lamps for direction indicators and headlights;
engine temperature indicator;
voltmeter.

Correction of motorcycle appearance

Changing your appearance can happen in different ways. Among the most common:

Fairing installation.
Replacing the fuel tank.
Seat modification.
Motorcycle painting.

Fairing installation. This is the first thing that many lovers of modifying the appearance of motorcycles undertake. Although it is possible to cope with such a task, it should be recognized that the development of such components is a complex task that requires specific skills. The enterprises employ entire groups of specialists engaged in the design of fairings.

A person who does not have specific skills, despite all his talents, will most likely receive a result of dubious quality. The surface of the fairing will be uneven, which is clearly visible in the 5 photos posted online illustrating Jupiter tuning. The aerodynamics of the motorcycle may not improve, but worsen. Take all this into account before you decide to start making and installing a fairing.

Replacing the fuel tank is a completely justified decision. But you shouldn’t try to make a complex part yourself. This is not an easy task even for enterprises with special technological equipment. It’s smarter and easier to choose a ready-made fuel tank from some other motorcycle model.

Seat modification. You can try to make a change to the standard structure by upholstering it with a new material like leather or a good substitute, and installing a new filler. But the original seat has a significant mass. To reduce the weight of the motorcycle, it makes sense, as in the case of the fuel tank, to select a part from other equipment.

Painting IZ Jupiter-5 is a good thing. Here you can let your imagination run wild. But the best results can be achieved if you know the laws of color combinations or consult with a professional designer. Otherwise, instead of a stylish combination of contrasting colors, you can end up with an eye-catching color scheme.

If you are interested in long-lasting paintwork, first apply a layer of high-quality primer and refuse to use nitro paint, preferring alkyd or polyurethane enamels.

External tuning Izh Jupiter 5

In most cases, tuning primarily affects the appearance of the motorcycle. They are trying to make it similar to a cross-country version, “comb it” like a high-speed sports bike, or make it into an imposing chopper. It depends on the personal preferences of the tuning maker what changes to what.

The greatest effect in external transformation can be achieved by installing new fairings. There are two options: purchase a ready-made motorcycle from a different model and try to install it by changing the mounts, or order an absolutely unique one according to individual taste. The second option, as a rule, costs a little more.

In addition, when tuning the Izh Jupiter 5 motorcycle, they resort to chrome plating. Almost all metal parts that have the ability to shine fall under it. Typically this includes the exhaust pipe, engine block, fork, wheel rims and much more.

Engine tuning

Upgrading a power unit usually means increasing power. This issue can be solved in a simple way:

cylinder boring;
correct installation of valve timing.

The first method is outrageously simple, but not in the case of the fifth Jupiter. The fact is that the cylinder system simply will not survive serious boring due to its fragility. And considering that the “exhaust” from such a modernization practically does not improve power, it can be immediately discarded.

The second method is more practical and effective. Thanks to the skilled boring of the gas-passing cylinder windows, the motorcycle noticeably increases power.

If you want to make a real rocket out of your Izh, you can additionally install a carburetor on each cylinder and balance them correctly. This will optimize the fuel supply and increase the speed characteristics of the motorcycle. The installation of contactless ignition will also have a positive effect on the bike.

Piston system Jupiter 5

Jupiter 5 tuning is also a modification of the piston system, such work changes the power for the better. First, the piston pins are polished, the connecting rods are processed, the cylinder head is polished, and it needs to be scraped off from carbon deposits. It is possible to insert copper gaskets from the IZH Planet 5 model under the BC heads and correctly set the ignition timing.

When you have finished “muting” the engine, do not forget to install a zero-resistance air filter for better fuel combustion. place the “cans” on the muffler or forward flow. It is necessary to polish the inside of the muffler and modernization is carried out by reducing the resistance in the exhaust chamber.

Experts in the great motorcycle business also advise changing the standard ignition system of the IZH Jupiter 5 motorcycle to a contactless one. From the “six” and “eight” a switch, a hall sensor from VAG or other foreign motorcycle analogues is taken and installed on the IZ, and the ignition coil can be rearranged from the OKI. Due to a powerful spark and less load on the standard generator, the motorcycle will function smoother and more accurately.