Purpose of the clutch IZ Planet and IZ Jupiter
Clutch - the name speaks volumes about the job it does.
In our case, the crankshaft engages the gearbox of the IZH Planet and IZH Jupiter engines. The connection should occur smoothly without jerking, this is necessary to start moving and smoothly change gears. In case of heavy loads, it protects engine parts from damage. The clutch is located in the left half of the crankcase, under the left engine cover.
To get to the clutch, you need to drain the oil and remove the cover with the gasket, first remove the levers and unscrew the mounting bolts.
The basket is constantly in working condition, the discs are tightly compressed by springs.
The motor transmission consists of two sprockets. The small drive is located on the crankshaft. A large star driven on a drum. The connection is made by a motor chain.
The engine gear ratio is 2.17 for all single-cylinder IZh models. For IZ Jupiter, the gear ratio is 2.57.
When assembling the motor transmission, the planar arrangement of the stars is controlled. No more than 0.4 millimeters are allowed.
Switching off occurs using a special device. The shutdown mechanism is installed in the right engine cover. This mechanism is used to make adjustments.
Checking the clutch drum
The first step is to check the foot start ratchet mechanism. This is where the main load falls. Turn the clutch basket over with the ratchet facing you, remove the retaining ring and disassemble the ratchet.
We inspect the teeth of the ratchet: they should be sharp without chips or other damage. If the teeth are wrinkled or broken, the winding foot will slip 100%. Many suffer from this problem due to thick oil or a weak spring - in fact, the reason for the foot slipping lies in the ratchet.
If the teeth on the basket are not worn out, it is advisable to rivet the ratchet: buy a new one in the store or remove it from another basket and rivet it. I riveted several baskets and they went without any problems until the “victory”...
An example of ideal ratchet teeth.
Often and thickly, the rivets on the ratchet weaken and if you don’t notice this in time, they are cut off. To prevent this trouble from happening to you, move the ratchet with your fingers. If it wobbles, drill out the old rivets and rivet them again. Pulling old rivets usually does nothing.
If you are making a clutch “for yourself” and for a long time, be sure to check the condition of the teeth for the motor chain.
If the teeth have already begun to turn back, then such a basket should be immediately thrown into the trash. It will no longer be of any use: the operating noise will increase, it will 100% eat up the motor chain, and there’s never an hour when one “fine” day it will lick your teeth and you will then be forced to push your jalopy for a long time and tediously...
An example of worn teeth.
It is not uncommon for the basket body to burst. Unfortunately, the body is made of cast iron and welding it will be problematic. If you find cracks on the body, try to find a welder who welds non-ferrous metals, the so-called “argon welder”; they usually take on welding cast iron.
An example of cracks in the basket body. By and large, this basket can still be saved: chamfer the cracks, weld and turn the seams on a lathe. But the teeth under the motor chain were worn out and I threw it away.
Clutch adjustment IZH Planet
To adjust the clutch control mechanism of motorcycles IZH Planet 5, IZH Planet 4, IZH-56, IZH-49, use adjusting screw 1 and locknut 2. By loosening the locknut by turning the screw clockwise, reduce the free play of the control lever. When turning the screw counterclockwise, the free play increases. After completing the adjustment, tighten the locknut. The normal free play value is determined by the free movement of the end of the clutch lever by 5..10 mm.
The normal amount of free play is determined by the free movement of the end of the clutch lever by 5..10 mm.
Clutch adjustment IZ Jupiter
On motorcycles IZH Yu and IZH Yu K, adjustment of the clutch release mechanism begins with the release mechanism, for which the adjusting screw is screwed in all the way and released 1/4 -1/2 turn, after which the lock nut is tightened.
The correct installation is checked by pressing the shift pedal in one direction or another. Moving the front end of the shift pedal 5-5.5 mm from the neutral position should not lead to movement of the pressure plate. After this, the manual release is adjusted using the adjusting screw located in the left post of the clutch lever on the steering wheel (the free play is 5-10 mm).
Functional purpose of the gearshift clutch
Before you adjust the clutch on the Izh-Jupiter 5 motorcycle, it’s a good idea to understand its purpose and principle of operation. The essence of the transmission clutch:
- Ensuring the transmission of torque from the large gear of the motor transmission to the gearbox input shaft.
- Short-term separation and smooth connection of transmission elements to each other.
Izh motorcycles were equipped with a mechanical clutch, the operation of which is based on the friction force between the driven and driving disks. It is a multi-disc design operating in an oil bath - a classic arrangement that the Izhevsk Machine Plant used until 2008. Working in tandem, the main chain drive and four-speed gearbox are reliable and proven by many generations of motorcyclists.
Adjusting the clutch springs
Adjusting the springs is not difficult, the main thing is to get it right. We start by placing the motorcycle on the center stand. Then remove the lid, draining the oil in advance. We squeeze the lever on the steering wheel to the limit and make sure to fix it. Next we turn on the speed, preferably the first one. We take the wheel and begin to rotate. We try to determine by touch how much effort we are applying. We look at the coupling as it rotates and determine which springs are loosely tightened. We mark them with chalk, then tighten them. We begin to rotate the wheel again and if you feel that the wheel has become easier to spin, then everything has been done correctly. The process must be repeated to achieve a better result. After this, we check the result obtained while moving. If, as the load increases, the clutch begins to slip. All springs must be tightened using nuts. In this case, all nuts must be turned the same number of turns.
Clutch faults
Possible malfunctions that may appear during operation of IZ motorcycles.
The clutch of IZH Jupiter IZH Planet is slipping reasons
The malfunction is noticeable during sudden acceleration. We increase the speed, but the motorcycle does not accelerate. The same thing happens when driving on a steep hill as the load increases. The motorcycle cannot overcome the obstacle and stops, although the crankshaft speed does not drop. The discs get very hot and wear out quickly. It is impossible to operate the equipment in this condition; the cause must be found and eliminated.
This malfunction indicates that the disks are poorly pressed against each other.
There may be several reasons:
- The adjustment was not carried out correctly
- The springs have lost their former elasticity
- The discs have worn out and become thinner.
- Wear of drive parts
A serious problem could be a jammed control cable. The reason is damage to the shell and the resulting rust underneath. Gentle cleaning and lubrication, better replacement.
Check and wash the adjustment mechanism itself located in the right engine cover. Small particles of road sand that get into the mechanism with water can slow down the operation. After squeezing the lever, the parts do not return to their original position.
Drives clutch IZ Planet IZ Jupiter reasons
The clutch is driving - this is when the lever is squeezed all the way, and when the speed is turned on, the motorcycle immediately starts moving and cannot be stopped. You press the brake, the engine stalls. This indicates that the clutch is not completely disengaged.
The main reason is the springs that compress the discs. The discs are not evenly weakened and in some places are in strong contact with each other. The springs need to be adjusted correctly.
There is too much free play in the control lever on the steering wheel. If adjustment is not possible, replace worn control parts.
You need to check the pusher, which is located inside the input shaft of the gearbox. Perhaps the rod has become shorter.
Be sure to check the presence of the ball. Often during disassembly it rolls out and gets lost.
The ball is located inside the input shaft of a two-cylinder engine between the pusher and the thrust rod.
For a single-cylinder unit, the ball is located in the right cover between the screw with a control nut and the thrust rod in the input shaft of the box.
Tips for increasing the life of the Izh motorcycle clutch
The clutch is not intended for long-term operation in the disengaged position, as in this case increased wear of the mechanisms occurs. The control lever must not be released abruptly or very slowly. When turned on abruptly, the power transmission receives maximum load; when turned off slowly, the parts wear out even more than when turned off completely, due to slipping of the disks. If you have a habit of keeping your fingers on the lever, make sure that there is not even the slightest pressure on it. Even with a slight pressure that does not cause the discs to slip, the clutch mechanisms experience significant load. Do not use the clutch to disconnect the engine from the gear when stopping or coasting for a long time. In all these cases, use the gearbox, putting it in neutral. Also, never try to make the engine work easier on climbs and in other difficult situations, causing the discs to slip and, as a result, increase engine speed. In such cases, it is better to switch to a lower gear in advance.
Motorcycle care
Motorcycle braking system
Storing a motorcycle in winter
