Do you have to adjust both sides of the scooter valve?

If the scooter is brand new, it does not need to be adjusted.

The scooter adjusts the valve clearance up and down (i.e. intake valve rocker arm and exhaust valve rocker arm).

Both gaps should be checked, and if the gap is incorrect, it needs to be adjusted, and if the gap is normal, there is no need to adjust.

Hello, both sides of the scooter valve must be adjusted, so that it will be balanced! It's smoother to drive like this, that's it, I hope it can help you!

When adjusting the valve clearance of the scooter, the upper and lower (i.e. the intake valve rocker arm and the exhaust valve rocker arm) two clearances should be checked, and the incorrect clearance needs to be adjusted, and the normal clearance does not need to be adjusted.

There should be a gap between the top and bottom, the principle of thermal expansion and cold contraction, if there is no gap, the engine temperature will cause the valve to close loosely. What you describe later is the sound of the valve clearance being too large and the rocker arm and the valve striking.

The valve clearance of the scooter is slightly larger than that of other models, generally to reach about millimeters, if you adjust the feel to the left and right can be moved but there is no clearance up and down, such a valve clearance is slightly smaller, and the valve clearance of the scooter is easy to automatically become smaller in use, if the valve clearance is too small, it may cause cold car starting difficulties, unstable idle speed and other failures, and may aggravate the wear of the valve rocker arm and camshaft, but the valve clearance is not small enough to make the valve collide with the piston, do not wait until it presses the valve down for so long, The engine will not start because the valves are not closed tightly.

There is still sound after adjusting the valve clearance, you can re-check the valve clearance, check whether the valve rocker arm and camshaft are worn, whether there is a problem with the timing chain and tensioner, the abnormal noise of the scooter is mostly related to the above several valve parts, but the sound problem is not easy to judge in the case of not audible, it is best to find a car repairer to see.

In a four-stroke engine, one duty cycle crankshaft rotates 720 degrees (two revolutions), two round trips for the pistons, and one opening and closing of the intake and exhaust valves.

Valve type: There are three types of valves: side-mounted valves (SV), under-mounted valves (OHV), and overhead camshaft valves (OHC), depending on the valve position. Structurally, side-mounted valves are the simplest. However, due to the poor anti-explosion performance and high-speed performance of the engine after the use of this valve form, it can only be used for engines with low compression ratio and low speed, so it is no longer used abroad.

In terms of performance, the overhead camshaft valve is the most ideal, which can meet the requirements of high speed and high compression ratio of heavy power models, and has good economy, so it has been widely used.

The bottom-mounted valve structure is complex, and it is currently only used in the United States, Italy and other countries in West Germany (the R series motorcycles produced by the BMW plant) due to production habits.

Valve clearance adjustment steps for the scooter:

1) Remove the intake and exhaust valve chamber cover and magneto cover;

2) rotate the magneto rotor, so that the "T" engraved line on its outer circular surface is aligned with the engraved line on the casing, and the piston should be at the top dead center of the compression stroke at this moment;

3) Carefully insert the feeler gauge with the thickness of the specified valve clearance value into the valve clearance and pull it back and forth, if you feel a slight resistance, the clearance is appropriate.

4) If the gap is not suitable, loosen the adjustment nut, while turning the adjustment screw with a small wrench, pull the feeler gauge to check the gap, after the gap is suitable, and then tighten the adjustment nut, the gap may change, and the feeler gauge should be remeasured again.

Questions and answers. Hello, after removing the spark plug, use the foot start pedal to find the compression top dead center of the 1 cylinder, and adjust the gap between the intake and exhaust valves to 5 to 10 clearances.

I don't know if I ask a question.

Which is the intake valve? Which is the exhaust valve? Also Which is 1 cylinder?

The question is adjusted and started with the foot. It's still loose.

The adjustment method is basically the same, but at present, most of the domestic scooters are split cylinder heads, as long as the cylinder head cover is removed, the valve rocker arm and timing sprockets and other components can be exposed, and it is very convenient to adjust the valve clearance. If it is an integral cylinder head, that is, the cylinder head is equipped with intake and exhaust valve covers and cylinder head timing sprocket covers respectively, you need to remove the left cover of the cylinder head to confirm the timing, and then adjust the valve clearance.

How to adjust the valve clearance of the scooter?

How to adjust the valve clearance of the scooter?

1.As long as the valve clearance is not suitable, it can be adjusted at any time, and it can generally be adjusted at one time, and there is no need to adjust it repeatedly.

2.Formal adjustment, need to use the feeler gauge to measure, the general valve clearance according to the model is different, the clearance is on the left and right, the scooter can be larger, but this is more troublesome, so generally in the maintenance is to feel by hand with experience, left and right smooth clearance, up and down without clearance, but some cars will be equipped with a spring or spring pad to eliminate the gap on the valve rocker arm shaft, so it may not feel obvious.

3.The valve clearance must be adjusted to normal, too large or too small is not good, let alone artificial faults can not be adjusted up or small, too large and too small have only disadvantages, no advantages.

4.The valve clearance must be adjusted when the car is cold, and the valve clearance will change when the car is hot, and it should be based on the cold state. If you feel that the power decreases and is accompanied by unstable idling after adjustment, the gap should be smaller, which should be adjusted in time, otherwise it will not only affect the normal use, but also the valve clearance will increase the pressure load of the rocker arm and camshaft and increase wear.

However, if your car is a top rod engine, it is inevitable that the hot car valve will be loud, so there is no need to pursue too quiet.

How to adjust the valve clearance of the scooter?

The valve clearance is not adjusted casually, there is a special thickness gauge, which must be adjusted according to the regulations.

The valve clearance rang wider, and the cannon was fired.

The gap is small, and the car is unstable.

Simple answer: Use a snake ruler to measure the following! The noise is relatively small!

The valve clearance should be adjusted when the car is cold, and it may not be accurate when the car is hot. It is not good for the valve clearance to be too large or too small, and if the valve clearance is too small, it will cause poor closing, difficulty in starting when the car is cold, unstable idling, weak engine, and even wear out the valve rocker arm and camshaft. If the valve clearance is too large, there will be an obvious clicking sound, and it is possible to knock the valve stem head out of the concave, resulting in noise that cannot be eliminated, and the valve clearance is too large and will also cause the reduction of intake and exhaust volume, which will affect the power performance of the engine.

Valve leakage and carburetor problems will cause difficult starting, who is more likely to be more likely of the two, you can negotiate with the repair personnel, if the carburetor is replaced with no use to return, can not be used because you must buy, even if it is not its problem, otherwise check the valve first, but for difficult starting, the carburetor is more likely, but the carburetor is not as intuitive as checking the valve, and the valve clearance check can determine whether it is normal, The carburetor may have to be tested or even tested for a period of time to determine whether it is a problem, and in many cases, the carburetor can be debugged, and does not necessarily need to be replaced with a new one, if the carburetor is not good, it may not be as good as the old one.

Experienced mechanics are all available. The difficulty of starting a motorcycle has a lot to do with the carburetor.

Search it: how to adjust the scooter valve clearance to save fuel.