4. Why should the lawn mower use a large throttle when cutting grass?

Rotary-knife lawnmowers rely on the high-speed rotation of the blade to cut grass. If the linear speed of the blade tip is not enough, the effect of cutting the grass is not good. Therefore, use high throttle and high speed when cutting grass. In addition, the carburetor and automatic speed control device of the lawn mower make its fuel consumption not high at high throttle such as no load. Only when it is loaded, its speed will reach 2800r.pm from 3400r.pm at no load. Therefore, You don't need to use a small throttle because you want to save fuel, and the grass cutting effect is not good.

5. Why should engine oil be changed regularly?

The role of the correct brand of lawn mower oil on the machine is: lubrication, cooling, cleaning, and strengthening the piston seal. After the machine is used for a period of time, as the dust in the air enters and the metal scraps from the machine wear into the oil and the oil is heated and moved, its various performances will decrease. If the oil is not replaced in time, it will accelerate the wear of the machine and reduce the machine. The service life of the battery may even cause accidents such as holding tiles, pulling cylinders, and connecting rods. Therefore, the oil should be replaced at a fixed time according to the instructions to ensure the normal use of the machine.

6. Why do we need to clean and replace the air filter of lawn mower regularly?

The air filter element prevents dust from entering the cylinder and avoids the premature wear of the machine parts caused by the dust entering the cylinder. It should be cleaned frequently and replaced at a fixed time. When the machine is used, the dust from the air pumping will be deposited on the air filter element, which will reduce the air intake and increase the combustion mixture ratio, resulting in incomplete combustion and reduced power. Long-term work will produce carbon deposits and aggravate the wear between the cylinder and the piston. , The carbon deposit falling in the cylinder will cause the cylinder to be pulled and the machine power will be lost. The air filter element should be cleaned and replaced in time to ensure the normal operation of the machine. At the same time, the outer wall of the machine cylinder should be cleaned frequently to ensure its heat dissipation effect. Otherwise, it will also increase machine wear.

7. Why do I find organic oil on the paper air filter after using the lawn mower?

Excessive addition of engine oil is the main cause of the above failures. Because the excessive oil will be discharged from the crankcase through the breathing valve and breathing tube when the machine is running, and sprayed on the air filter. This will cause the air filter to be scrapped.

8. What is the reason for the black smoke from the muffler of the engine?

The cause of the above failure is that the mixing ratio of intake combustion is too deep. If this happens, try to clean or update the air filter first. If the fault is not eliminated, the engine carburetor needs to be adjusted or cleaned.