I just bought a motorcycle for 4 days, which is very expensive! ! What to do! ! !

Generally speaking, it is impossible for 40 yuan of oil to run 100 km. Maybe the oil meter seems to be on the oil-free scale (the oil meter can't accurately reflect the remaining oil). In fact, there is still a lot of oil in the tank. You can write down the scale at this time, add 10 yuan oil, and see how many kilometers you can run to this scale, so that you can roughly calculate the fuel consumption, or fill up the fuel tank after running 100 kilometers, and the fuel consumption will come out.

You can take off the spark plug to see the color. If it turns black, it means that the oil-gas mixing ratio is too high, that is, it is rich in oil. You may spend more oil at this time, but it won't be as expensive as you said. Someone can help you adjust the carburetor mixing ratio. If it is white and the mixing ratio is low (lean in oil), the mixing ratio should also be adjusted. If it is brick red, the mixing ratio is normal.

"A few times, the car stopped for a while or spent the night, and found that the oil was a little less." This may be because the scale of the oil meter has become smaller, not because there is less oil, but because the voltage is low or it expands with heat and contracts with cold.

Method of adjusting the mixing ratio of carburetor: warm up the car 10 minutes or so, and then adjust the throttle screw of carburetor clockwise and counterclockwise (crosshead screw on the right front side of carburetor). Adjust the engine speed slightly higher than the normal idle speed, and then turn the idle oil concentration adjustment screw (copper screw with prefix on the left side of carburetor, clockwise downward and counterclockwise upward). ), find out the highest speed of the engine at this throttle position.

Adjust the throttle screw slightly counterclockwise to reduce the engine speed; Then adjust the idle oil concentration adjustment screw to find a higher engine speed. This is repeated several times according to the mode of "throttle down+idle oil up" until the maximum speed of the throttle valve is equal to the standard idle speed of the whole vehicle when it is adjusted to a certain position.

If you don't understand, you'd better ask someone to help you.