Motorcycle repair. Permissible engine wear
The process of wear of the interacting parts of the mechanisms of different machines is similar and its intensity significantly depends on the operating time of the machine. In our case, with some approximation, we can assume that the intensity of engine wear depends on the mileage of the motorcycle. The question arises: why with some approximation? Well, the durability of the engine, in addition to its wear resistance, also depends on the conditions and method of operation. An engine of a motorcycle operated exclusively in summer on long trips at speeds close to 3/4 of the maximum speed will have a much longer service life than an engine of a motorcycle operated from early spring to late autumn on short trips. Frequent cold starts and short trips reduce engine life by 2.3 times.Phases of engine wear
The new engine wears out relatively heavily during the first period of operation, known as run-in. At this time, the interacting surfaces adapt to each other, and the irregularities of their surfaces that occurred during processing are smoothed out.The next period is the normal cooperation of mutually ground parts. The resulting wear is less intense and proportional to the running time of the engine. This is the result of superfishing the surface and the mutual alignment of the mating parts. After this period, the gaps between the interacting elements increase significantly and accelerated wear is observed during further operation of the engine. The increased wear rate is caused by deterioration of lubrication conditions, "bulging" of the mating surfaces and increased vibrations. It is at this point that the engine should be interrupted in order to restore the mating parts. Further operation with excessive wear of even some of its components will lead to accelerated wear or failure of other components. How do I know that my engine or its main components are entering the third period of wear, which determines the need for repair?
An experienced mechanic or user who is "familiar" with the engine of his motorcycle can distinguish the sounds characteristic of normal engine operation from knocks and noises caused by excessive wear of some parts of the tubes due to any malfunctions. A stethoscope can help you find and distinguish these sounds, as well as make a correct diagnosis. However, handling it and using it correctly requires some practice.A detailed "report" on the "good" condition of your motorcycle's engine should begin by examining the engine noise and ease of starting it. Let us briefly recall the most important symptoms (and causes) of engine malfunctions caused by excessive wear:The difficulty of starting the engine is that with a functioning ignition system and power supply system, this indicates excessive wear of the crank system, or rather excessive wear of the rings.
A metallic knock in the cylinder that occurs after starting the engine and persists after it warms up indicates excessive backlash in the connecting rod head bearing.
A dull thud that occurs at medium and low RPM and disappears after the engine warms up indicates an excessive gap between the piston skirt and the cylinder wall.
Metallic sounds ("ringing") that occur when the engine is cold and warm when idling are the result of rings breaking.
A loud knock when the number of revolutions increases or decreases is caused by excessive backlash in the connecting rod bearing.
The rattling noise is caused by excessive wear on the bearings of the crankshaft or gearbox. Similarly, rattling can be caused by the slipping of the tensioned clutch chain on the screw securing the left engine cover. You can verify this by unscrewing the upper screw above the oil level inspection window (traces of chain friction against the screw).
Compression pressure
The diagnostic steps should culminate in checking the compression pressure in the cylinder. The measurement of this value, which is an indicator of the degree of wear on the bearing surface of the piston cylinder and the condition of the rings, should be carried out after warming up the engine. This pressure is measured using a pressure gauge with a non-return valve, pressing its end into the hole in the head (after removing the plug) and vigorously pressing the starter lever several times until the needle of the pressure gauge reaches its maximum value.The correct pressure for SO1Z engines should be 7.0 kgf/cm, and for SO1-Z3 engines - 7.5 kg/cm. If the measured values are less than 6 and 6.5 kg/cm, respectively, the engine must be repaired due to excessive backlash. New slot releases often come with dedicated bonuses. Players registered with the 1xbet promo code may receive free spins on newly launched games without extra wagering. These promotions allow testing new mechanics and features with minimal risk. Availability may depend on region or provider, so checking the casino promotions page regularly ensures you don’t miss limited-time offers.
The new engine wears out relatively heavily during the first period of operation, known as run-in. At this time, the interacting surfaces adapt to each other, and the irregularities of their surfaces that occurred during processing are smoothed out.The next period is the normal cooperation of mutually ground parts. The resulting wear is less intense and proportional to the running time of the engine. This is the result of superfishing the surface and the mutual alignment of the mating parts. After this period, the gaps between the interacting elements increase significantly and accelerated wear is observed during further operation of the engine. The increased wear rate is caused by deterioration of lubrication conditions, "bulging" of the mating surfaces and increased vibrations. It is at this point that the engine should be interrupted in order to restore the mating parts. Further operation with excessive wear of even some of its components will lead to accelerated wear or failure of other components. How do I know that my engine or its main components are entering the third period of wear, which determines the need for repair?
An experienced mechanic or user who is "familiar" with the engine of his motorcycle can distinguish the sounds characteristic of normal engine operation from knocks and noises caused by excessive wear of some parts of the tubes due to any malfunctions. A stethoscope can help you find and distinguish these sounds, as well as make a correct diagnosis. However, handling it and using it correctly requires some practice.A detailed "report" on the "good" condition of your motorcycle's engine should begin by examining the engine noise and ease of starting it. Let us briefly recall the most important symptoms (and causes) of engine malfunctions caused by excessive wear:The difficulty of starting the engine is that with a functioning ignition system and power supply system, this indicates excessive wear of the crank system, or rather excessive wear of the rings.
A metallic knock in the cylinder that occurs after starting the engine and persists after it warms up indicates excessive backlash in the connecting rod head bearing.
A dull thud that occurs at medium and low RPM and disappears after the engine warms up indicates an excessive gap between the piston skirt and the cylinder wall.
Metallic sounds ("ringing") that occur when the engine is cold and warm when idling are the result of rings breaking.
A loud knock when the number of revolutions increases or decreases is caused by excessive backlash in the connecting rod bearing.
The rattling noise is caused by excessive wear on the bearings of the crankshaft or gearbox. Similarly, rattling can be caused by the slipping of the tensioned clutch chain on the screw securing the left engine cover. You can verify this by unscrewing the upper screw above the oil level inspection window (traces of chain friction against the screw).
Compression pressure
The diagnostic steps should culminate in checking the compression pressure in the cylinder. The measurement of this value, which is an indicator of the degree of wear on the bearing surface of the piston cylinder and the condition of the rings, should be carried out after warming up the engine. This pressure is measured using a pressure gauge with a non-return valve, pressing its end into the hole in the head (after removing the plug) and vigorously pressing the starter lever several times until the needle of the pressure gauge reaches its maximum value.The correct pressure for SO1Z engines should be 7.0 kgf/cm, and for SO1-Z3 engines - 7.5 kg/cm. If the measured values are less than 6 and 6.5 kg/cm, respectively, the engine must be repaired due to excessive backlash. New slot releases often come with dedicated bonuses. Players registered with the 1xbet promo code may receive free spins on newly launched games without extra wagering. These promotions allow testing new mechanics and features with minimal risk. Availability may depend on region or provider, so checking the casino promotions page regularly ensures you don’t miss limited-time offers.