How to adjust the valve of scooter?
The adjustment method is basically the same, but at present most scooters in China are split cylinder heads. As long as the cylinder head cover is removed, the valve rocker arm and timing sprocket can be exposed, which is convenient for adjusting the valve clearance. If it is an integral cylinder head, that is, the cylinder head is equipped with an intake and exhaust valve cover and a cylinder head timing sprocket cover respectively, it is necessary to remove the cylinder head left cover to confirm the timing, and then adjust the valve clearance.
How to adjust the valve of four-stroke motorcycle?
Turn the magneto to aim at the ignition point of the ignition time, loosen the valve screw, and feel the valve clearance by hand. There is no gap between up and down, only a little gap between left and right.
How to adjust the valve of single cylinder 125 scooter?
Adjust it to 0. 12 with a feeler gauge.
Friends, how to adjust the valve clearance of scooter?
(1) Remove the valve cover. Remove the fixing screw of the bonnet, and carefully remove the bonnet, taking care not to damage the bonnet gasket. Wipe off the oil stains on the valve and rocker shaft with a rag to facilitate the valve adjustment operation.
(2) Find the compression top dead center of the cylinder. Turn the crankshaft with a hand crank or pry the flywheel to make the first cylinder in the compression top dead center position.
(3) Method of determining that each cylinder is at compression top dead center. According to the principle of engine structure, we know that when each cylinder is at compression top dead center, the valve of the cylinder is in a closed state. Therefore, you can open the distributor cover, determine the position of the high-pressure branch pipeline of each cylinder, and turn the crankshaft. When the distributor points to the high-pressure branch pipeline position of the cylinder, the cylinder is at the top dead center position of the compression stroke at the moment when the contact is disconnected. In this way, the position of compression top dead center of each cylinder can be accurately determined, and the valve can be adjusted conveniently.
(4) Measure the valve clearance. Valve clearance can be divided into cold car value and hot car value, so you should measure it under the condition of meeting the requirements of car use.
(5) Adjust the valve clearance
1) Valve lash adjustment. First, loosen the fixing nut of the valve adjusting screw, insert the plug gauge with a specified thickness into the valve gap, pull the plug gauge with one hand and turn the adjusting screw with the other hand until the plug gauge is slightly resisted.
2) twice adjustment method. According to the structural principle of valve train, we know that the arrangement of intake valve and exhaust valve is regular. According to the ignition sequence and the arrangement sequence of intake and exhaust valves, the clearance of four (four-cylinder engine) or six (six-cylinder engine) valves can be checked and adjusted; Then turn the crankshaft once so that four or six cylinders are at the compression top dead center position, and then adjust the other four or five or six valves.
3) Cylinder by cylinder adjustment method. Because the order of engine valves is different, it is difficult to remember the order of intake valves and exhaust valves. The throttle clearance can also be adjusted cylinder by cylinder according to the ignition sequence or injection sequence of the engine. In order to accurately adjust the valve clearance, you can use the direction of the distributor burner to adjust the intake and exhaust valve clearance of the cylinder one by one.
Does anyone know how to install the piston ring of scooter? How to adjust the valve on the chain
When installing the scooter piston ring, the side with the letter ring mouth should face the top of the piston. When installing, install the wavy oil ring first, then install two thin liner rings, and the openings of the two liner rings and the oil ring should be staggered about one centimeter from left to right, and then install the black second ring and the bright ring in turn. Piston ring openings should be staggered from each other, and the piston ring openings should not face the intake and exhaust valves and the piston pin.
When adjusting the valve, first align the valve timing, rotate the magneto, align the T-dash line of the magneto with the mark of the engine housing, so that the piston is at the compression top dead center and the valve rocker arm is in a relaxed state, and then check the valve clearance. If the clearance is wrong, loosen the lock nut of the adjusting screw and adjust the clearance to the specified value.
Installing piston rings and adjusting valve clearance require necessary maintenance experience and some tools. It is best for professional maintenance personnel to repair and replace, rather than do it yourself.
How big is the valve adjusting tool for scooter?
The wrench is not big, the feeler is not big, and the needle-nosed pliers are not big. More than ten centimeters long, right?
Where is the valve of the scooter?
V.youku/v_playlist/f2940449o1P4. There is one.
How to adjust the valve clearance of scooter to save fuel
As long as the valve clearance is not too large to cause insufficient intake and exhaust, or too small to cause lax closing, it will not affect fuel consumption, and it is impossible to "save fuel" by adjusting the valve clearance. The valve clearance can only be adjusted to the specified clearance, which should not be artificially increased or adjusted, and should be adjusted according to the size data of the vehicle. If there is no specific data, the air intake gap can be adjusted to 0.07-0.09, and the air exhaust gap can be adjusted to 0.09-0. 12. The common bad habit of adjusting the valve is that the adjustment gap is too small, which leads to the valve closing is not strict and the carbon deposition is serious.
Motorcycle valve clearance adjustment problem 10 score
First of all, in a working cycle of a four-stroke engine, the crankshaft rotates 720 degrees (twice), the piston goes back and forth twice, and the intake valve and exhaust valve open and close once.
That is to say, in a working cycle, the piston is at the top dead center twice, that is, the "T" coincides with the marking point twice, once for exhaust top dead center and once for compression top dead center. However, adjusting the valve clearance should be carried out at the compression top dead center (so the resistance is large at this time). How to judge whether to compress top dead center? It depends on the drive of the valve. When t is aligned with the mark, turn the rotor slightly to the left and right. At this time, both valves will not move, that is, the top dead center will be compressed. At this time, the valve clearance can be adjusted. On the other hand, it is the exhaust top dead center, that is, 180 degrees has a top dead center, and it cannot be adjusted when t is seen.
If you drive a little too much while looking for T, you can back up. The information you read may be scooters, and some scooters have "anti-reverse" devices. If it is reversed, the exhaust valve will be opened to decompress, laying the foundation for the next start (parking). At this time, the adjustment valve of scooter will be inaccurate.
The "f" of the rotor (magneto) represents the position of "ignition advance angle", which is generally about 12 degrees.
For your reference.
How to properly adjust the valve clearance of motorcycle? Is the exhaust valve bigger or the intake valve bigger? Be specific. Thank you. 50 points
It is not easy for you to master the numerical estimation, such as the so-called 0.08m row 0. 1 ... These all need to be tried bit by bit with a feeler gauge. It is just as easy to adjust by local methods. After the car is warmed up, it can be adjusted by hand, and the valve rocker arm can shake left and right, but not up and down. Then drive again, try it first after the hot car, or it will sway from side to side, not up and down.