Motorcycle IZH Jupiter 3 - characteristics and features

Among domestic middle-class motorcycles, the leader was the IZH Jupiter series.

A special feature of these motorcycles was a two-cylinder engine, which provided some advantage over another Izhevsk machine-building motorcycle.

Serial production of IZH Jupiter began in 1961; this series included five generations and was produced until 2008.

Now let’s look at the third generation model “IZH Jupiter 3”.

It was no coincidence that this model was chosen, since at one time completely redesigned engines began to be installed on these motorcycles, which had significantly increased power compared to their predecessors , so IZH Jupiter 3 was already the first model of a new generation of motorcycles.

It should also be noted that this motorcycle was produced for a very long time - 10 years (from 1971 to 1981) and in this indicator only IZH-Jupiter 5 surpasses it.

Description of design

So, this motorcycle was first shown in 1971.

It was produced in two versions - “IZH Jupiter 3” and “IZH Jupiter 3K”.

They differed in that the “3K” was additionally equipped with a sidecar , but it had the ability to be detached from the motorcycle.

At that time, Jupiter 3 had a modern appearance and was well made, although it was based on its predecessor. All elements of the motorcycle were attached to a tubular frame.

To increase comfort, the front suspension travel was increased and the rear shock absorbers were made softer.

They changed the shape of the tank, it stopped being teardrop-shaped. But the headlight did not change; its housing continued to house the speedometer, ignition switch and warning lamps.

The seat is undivided, double . A rear fender with a brake light, turn signals and a license plate placed on it was attached to the seat body from below.

Turn signals on the IZH Jupiter family began to be installed precisely from the third model.

under the seat on both sides of the motorcycle , the left one was intended for installing the battery, and the right one was for storing keys.

The engine was located under the tank, which ensured that fuel flowed into the carburetor by gravity. To prevent spontaneous leakage of gasoline, a tap was placed on the tank.

The cylinders had an in-line arrangement. When designing a new engine for this motorcycle, the position of the cylinder fins was revised, which subsequently ensured better cooling .

One elbow came out of each of the cylinders, to which two exhaust pipes were screwed, mounted on the sides of the motorcycle under the footpegs.

The power system consisted of a single carburetor located behind the cylinders and connected to them by a pipe with a double outlet. In the base, the motorcycle came with protective covers covering the carburetor.

By reworking the engine, the designers managed to increase its power by 6 hp, which affected the speed; it increased to 120 km/h.

The gearbox was made integral with the engine. Torque was transmitted via a multi-plate clutch. The drive to the rear wheel was carried out by a chain.

The rear drive sprocket was housed in an aluminum housing.

The front suspension was made in the form of a telescopic fork, and the rear suspension was pendulum with two shock absorbers .

The brakes on both wheels are mechanically driven drums.

At one time , this motorcycle was awarded the State Quality Mark because it was reliable, easy to repair, and easy to start, compared to the IZH Planet.

Its only . It practically consisted of two contact systems, one for each cylinder.

This affected the convenience of installing the ignition; it was difficult to achieve the same advance angle on the cylinders.

The Kawasaki Versys 650 will be an excellent companion on long trips; you will find its technical characteristics in our review.

The bike that received the status of a “legendary” motorcycle:

The motorcycle sat in this barn for 38 years.

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The stroller was stored upside down: so as not to take up much space

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At one time, the state allocated this device to one forester in the Cherkasy region - to tour forestry areas. However, for these purposes he already had an older Izh Jupiter-2 in good condition, so the man decided to save the new equipment for better times and locked it in a dry barn for many years. They didn’t even register him with the traffic police!

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The motorcycle remained in this barn until 2014, when the owner’s grandson finally decided to get Soviet equipment out of the rubble, which had already become a rarity in 38 years. And especially in this condition!

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The mileage on the speedometer is 3 kilometers, and it is recorded in the accompanying documentation that came with the motorcycle. He also drove these kilometers around the factory testing ground: a test run to identify defects and assembly defects.

Specifications

The detailed characteristics of this motorcycle are summarized in the table:

Jupiter 5

Produced by the Izhevsk Machine-Building Plant from 1985 to 2008.

1. Comfortable. Softer sound with almost imperceptible vibration.
2. A powerful engine for its time.
3. Availability of cheap spare parts.
4. Simple design. Easy to repair yourself.

• Weight - 160 kg .
• Engine - two-stroke two-cylinder 24 hp .
• Cooling - air and also available with water cooling.
• The maximum speed is 125 km/h .
• Fuel consumption is from 5 to 7 liters per 100 km .

• Unstable ignition operation. Nowadays, the problem is treated by installing better equipment.
• Weak shock absorbers, which begin to break as soon as you leave the asphalt. Installing Chinese analogues and stiffer springs solves this issue.
• The motorcycle is considered too heavy for its size.

Approximate cost

Although the production of Jupiter 3 has long been completed, it can still be purchased, but only on the secondary market and often already somewhat altered.

Additionally, it can be noted that this motorcycle can serve as a good start for lovers of modifications and tuning .

This motorcycle is very cheap; it is offered on the secondary market at prices ranging from 7 to 19 thousand rubles.

Despite the rather advanced age of the Kawasaki GPZ 900 R, it is a cult superbike with a huge number of admirers and fans, which speaks of its quality and unique characteristics.

Now, if this motorcycle is properly equipped with an aerodynamic body kit, you can try to overcome the 200 km/h mark.

Questions about Jupiter 3, 4, 5 engines

Questions about Jupiter 3, 4, 5 engines

Post by ant-nickolay » Apr 26, 2015 11:21 am

Re: Questions about Jupiter 3, 4, 5 engines

Posted by SHORS » April 26, 2015, 8:50 pm

Re: Questions about Jupiter 3, 4, 5 engines

Post by ant-nickolay » April 27, 2015, 04:05

Re: Questions about Jupiter 3, 4, 5 engines

Post by Yurik96 » April 27, 2015, 12:53 pm

Re: Questions about Jupiter 3, 4, 5 engines

Posted by SHORS » April 27, 2015, 4:29 pm

Re: Questions about Jupiter 3, 4, 5 engines

Post by Yurik96 » Apr 28, 2015, 9:33 pm

Well then, the 4th Jupiter is 6 horses more powerful than the 3rd due to the additional cylinder in the glove compartment.

turn over the 4th and 3rd cylinders and you will immediately see the difference - a completely different shape of the bypass channels. It is only from the street that it seems that they are completely interchangeable, but inside there is a huge step and there is a 40-50 percent overlap of channels.

Re: Questions about Jupiter 3, 4, 5 engines

Posted by SHORS » April 29, 2015, 11:37 am

Yurik96 wrote: well then the 4th Jupiter is 6 horses more powerful than the 3rd due to the additional cylinder in the glove compartment.

turn over the 4th and 3rd cylinders and you will immediately see the difference - a completely different shape of the bypass channels. It only seems from the street that they are completely interchangeable, but inside there is a huge step and 40-50 percent of the channels overlap

Jupiter 4 is more powerful than 3 due to changes in valve timing in the sleeve itself. The crankcase and cylinders IZh Yu1, Yu2, Yu5 have the same shape of bypass windows and four-channel cylinder purge (at the same time, in the crankcase Yu5 the studs are spaced apart). Yu1, Yu2, the purge of the cylinders is the same, on Yu 5 the gas distribution phases are different (more power) The crankcase and cylinders Izh Yu3, Yu4 have the same shape of bypass windows (different from Yu1.Y2, Yu5) and two-channel purge of the cylinders (as a result of which their cylinders are completely interchangeable). The increase in power was achieved by changing the valve timing in the liners. the u4 crankcase differs from the u3 crankcase in that it has a seat for the generator (6v for u3 and 12v for u4)

Yurik 96, unfortunately for you, this is so.

Source

Photo gallery

IZH Jupiter 3 is a Soviet road motorcycle, middle class. The designers did a great job creating it, and as a result they got a comfortable, reliable and easy-to-use motorcycle. And you can evaluate his external data in our small selection.

Comparisons and differences

Jupiter 5 is a livelier motorcycle with good throttle response. In terms of comfort, it is head and shoulders above its opponent. The two-cylinder engine is more powerful and faster in speed. According to the passport, the speed is 125 km/h, but it’s realistic to reach 150 km/h only after engine repairs are provided. The ignition is not stable and causes many problems. Fuel consumption is considered high.

Planet 5 is a locomotive, it has decent torque, but when applied to the throttle it reacts very sluggishly. Gears are switched with over-throttle. But the traction is head and shoulders above due to its torque, it’s like a tractor. Another difference is the absence of ignition problems . Repairing it is even easier and cheaper. Fuel consumption is considered low.

What is best, when and for whom

Having done a little analysis of these two models. It became clear that it would not be possible to clearly identify the best. Because some people like speed, while others prefer reliability. Some people put comfort first, others put fuel consumption first. Everyone exploited their “iron horses” in different ways and looked after them differently.

After conducting a survey, opinions were divided; rural residents gave preference to Planet 5. And residents of cities and urban-type settlements gave preference to Jupiter 5.

Villagers preferred Planet 5 because it was a workhorse. Bring, take, go fishing, hunting is ideal for Planet 5. Jupiter 5 was preferred by people who need transport once a week, for example, to go to the country.

I would like to note that these models are in demand and are still relevant today. On average for 20 thousand rubles. You can buy a motorcycle that will be in good working condition. There are no problems with spare parts. Both native and Chinese analogues are available for sale. There are no motorcycles on the market with similar characteristics and there won’t be in the near future.

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