What is the reason why the motorcycle rides over the stop and then starts without a compression rati

There was no problem with normal riding, but there was no compression when starting again after parking, and it was most likely that the valve was bent at the top. This situation is mostly caused by bad gasoline, inferior gasoline will deposit a lot of viscous matter on the intake pipe between the carburetor and the engine, and when these gasoline is burned, it will also make some viscous matter adhere to the valve guide, and when it accumulates to a certain extent, it will stick the valve. When driving normally, due to the pull of the engine, the valve will not be sticked, if it is after the ignition, the valve loses its driving force, the resistance of those sticky objects is greater than the elasticity of the valve spring, the valve will be stuck by these things and cannot be replaced, and the next time it starts, the upward piston will bend the valve upward.

Not all cars with this type of gasoline will have problems or problems immediately, and the accumulation of sticky substances will take some time, especially for cars that are not used too often.

If this is the case, it is best to drain the gasoline in the tank and carefully and thoroughly clean the oil pipe, carburetor, intake pipe and the intake side of the engine cylinder head after replacing the valve to avoid recurrence of such problems after replacing the valve.

The reason you said is too simple, the oil must be changed in three months, and it should not exceed 5,000 kilometers if you ride regularly. Otherwise, the viscosity of the engine high-temperature oil is greatly reduced, and it is also allowed to start, and then check whether the high-pressure pump is normal, and try to change to a new good spark plug. No big problem, don't worry.

Summary. Hello, if the motorcycle is not compressed, there are only two possibilities, one is that the piston ring is seriously worn, and the other is that the valve leakage judgment method is to put a little oil into the combustion chamber at the position of the spark plug, if the compression will increase a little, that is, the piston ring is not good because the valve is leaking, even if the oil is not sealed, there is also a need to pay attention to the valve chamber cover to see if the near exhaust valve is too tight, if the valve is adjusted too tight, the valve will also be closed, not strict, Compression is gone.

What should I do if the motorcycle is not compressed?

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Hello, if the motorcycle is not compressed, there are only two possibilities, one is that the piston ring is seriously worn, and the other is that the valve leakage judgment method is to put a little oil into the combustion chamber at the position of the spark plug, if the compression will increase a little, that is, the piston ring is not good because the valve is leaking, even if the oil is not sealed, there is also a need to pay attention to the valve chamber cover to see if the near exhaust valve is too tight, if the valve is adjusted too tight, the valve will also be closed, not strict, Compression is gone.

Summary. If the motorcycle is not compressed, there are only two possibilities, one is that the piston ring is seriously worn, and the other is the valve leakage.

What's going on with the motorcycle not compressing.

If the motorcycle is not compressed, there are only two possibilities, one is that the piston ring is seriously worn, and the other is the valve leakage.

The way to judge is to inject a little oil into the combustion chamber at the spark plug position, if the compression will increase a little, then the piston ring will not work.

Because the valve is leaking, even if the oil is injected in, it will not play a sealing role.

Another thing you need to pay attention to is to open the valve chamber cover to see if the near exhaust valve is too tight, if the valve is adjusted too tightly, the valve will also close, not tight, and the compression will be gone.

You follow my methods to judge, and if you have any other questions, you can contact me.

Summary. Hello, this question can give you a perfect reply, wait for me to sort out the information, I'm typing, 2-3 minutes, don't finish.

Hello, this question can give you a perfect reply, wait for me to sort out the information, I'm typing, 2-3 minutes, don't finish. Summary.

Hello, this question can give you a perfect reply, wait for me to sort out the information, I'm typing, 2-3 minutes, don't finish.

Motorcycles don't have compression words. This is the engine with a pull cylinder. That is to say, the wear gap in the engine is too large, and this must not be compressed, that is, there is no pressure in the cylinder.

If you need to deal with this, you need to overhaul the engine after the engine is disassembled, you need to replace the piston inside, including the piston ring, including the valve, valve seal, including the gasket, these things can be disassembled and overhauled, and they can be repaired.

The motorcycle suddenly stalls during driving, and the motorcycle cannot be refueled, and there is no compression.

Let's start with a few possibilities that are not compressed:

1. The cylinder, plug and ring are worn, and the cylinder pressure cannot be guaranteed (solution: replace the cylinder, plug and ring kit) 2. The valve is not strict, and the valve cannot be completely closed due to carbon deposit, valve stem deformation or valve wear (solution: clean up the carbon deposit at the valve gate, and the valve or cylinder head needs to be replaced if it is worn, and the valve can be finely ground if it is slightly damaged).

3. The cylinder gasket is damaged, and the air leakage at the joint of the cylinder block after damage (solution: replace the cylinder gasket) 4. The sturdy screws of the cylinder block are loose, and they are not tightened during installation, resulting in air leakage at the joint of the cylinder block (solution: tighten the cylinder screws).

5. The nozzle is loose, and the air leaks from the nozzle, resulting in a drop in cylinder pressure (solution: tighten the nozzle) without compression is basically these kinds of problems, see if you can rule it out.

Remove the spark plug, specify the orifice with food, step on the starting lever to feel the strength of the compression ratio, and then drop a few drops of oil and then step on the starting lever to feel, if the obvious compression ratio increases, the piston ring is worn too much, and there is no change, it may be a problem with the valve mechanism, if this is the cause of sudden appearance, you can consider whether the upper rocker arm is loose or damaged, and the gradual appearance may be valve wear.

Motorcycles, driven by gasoline engines, rely on the handle to control the front wheels to turn to the loud two-wheeled or three-wheeled vehicles, light and flexible, fast driving, widely used in patrol fiber, passenger and cargo transportation, etc., also used as sports equipment. In terms of general direction, motorcycles are divided into street bikes, road racing motorcycles, off-road motorcycles, cruising cars, station wagons, etc.

Do not use the instrument to check: the line to remove the spark plug, with the food specified in the orifice, step on the starting lever to feel the strength of the compression ratio, and then drop a few drops of oil and then step on the starting lever to feel, if the obvious compression ratio increases, the piston ring is worn too much, there is no change, it may be a problem with the valve mechanism, if this is the cause of sudden appearance, you can consider whether the upper rocker arm is loose or damaged, and the gradual appearance may be valve wear.

Motorcycles, driven by gasoline engines, are two-wheeled or three-wheeled vehicles that are steered by handlebars, are lightweight, flexible, and fast, and are widely used for patrolling, passenger and freight transportation, etc., and are also used as sports equipment. In terms of general direction, motorcycles are divided into street bikes, road racing motorcycles, off-road motorcycles, cruisers, station wagons, etc.

Take, for example, how four-stroke and two-stroke engines work:

Four-stroke engines are used in a wide range of applications, and four-stroke engines mean that the piston ignition of the cylinder once every four reciprocating movements. Here's how it works:

1.Air intake: At this point, the intake valve opens, the piston descends, and the mixture of gasoline and air is sucked into the cylinder.

2.Compression: At this time, the intake and exhaust valves are closed at the same time, the piston goes up, and the mixture is compressed.

3.Combustion: When the mixer is compressed to a minimum, the spark plug jumps to ignite the mixture, and the pressure generated by the combustion pushes the piston down and drives the crankshaft to rotate.

4.Exhaust: When the piston descends to the lowest point, the exhaust valve opens, the exhaust gas is discharged, and the piston continues to go up to discharge the excess exhaust gas.

The reasons for the lack of compression of the motorcycle engine are, serious wear and leakage of the piston ring of the cylinder barrel, damage of the piston failure, and air leakage caused by valve deformation, which can be solved by inspection and maintenance.

Is there no compression pressure, if so, I feel that there is a problem with the person who repaired the car for you, no pressure is the cylinder leakage, if there is no pressure at all, it is basically not good to repair if you don't change things,

This is also the problem with my car, go to the repair office (I know), turn on the front end of the engine and turn on the exhaust spring.

If there is really no compression, it is likely that the valve top is (which I have encountered before), and of course it could be that there is a problem with the piston assembly. The specific ** must be based on the reason, but there should not be so many.

If there is no compression, there is a problem with the engine. Just change the ring. More than 100 done! Unless your car is a Honda or Yamaha, the replacement parts are original