1. It is difficult to start a two-stroke engine. In addition to checking whether the carburetor and shock absorber are normal, it is also necessary to check whether the cylinder block, piston and piston ring are too worn to cause insufficient cylinder pressure, whether the crankshaft oil seal and reed valve leak oil, whether the spark plug is defective or has too much carbon deposit, and whether the intake pipe leaks air.

2. If the acceleration is weak and the speed is slow, check whether the exhaust pipe is blocked by too much carbon, whether the cylinder exhaust port is blocked by carbon, whether the air filter is blocked, clean the carburetor and check whether the transmission system slips. If the cylinder pressure is insufficient, the crankshaft oil seal and reed valve will leak oil, which will also affect the power.

I don't know if your car is a straddle or a scooter. If it is a scooter, there may be some noise at the rear wheel. As long as it's not too loud, there's no problem. Rustling should be part of the sound, which is normal. If it is a fault, it should be louder when driving. You can also check whether the gear oil is normal.

4. Scooters, especially two-stroke scooters, will definitely have higher fuel consumption, but if they are scooters, they are generally equipped with negative pressure fuel tank switches. There should be no oil flow when the oil pipe from the tank switch to the carburetor is closed. When the engine is working, it needs to suck the oil pipe or install it on the engine to generate engine oil. If the fuel tank switch cannot be closed or there is oil flowing out of the oil suction pipe, it may be that the fuel tank switch is damaged or the oil pipe is inserted incorrectly, which will also increase fuel consumption. If the fuel tank switch is broken, it should be replaced in time. Other things that can affect fuel consumption, such as air filter, exhaust and transmission parts, can be checked and maintained.

No.90 gasoline can be used for two-stroke cars. If there is no 90 gasoline, you can use 93 gasoline. Which brand of gasoline should be used depends on the compression ratio of the engine. The compression ratio of two-stroke engine is low, but the use of high-grade gasoline will affect the combustion quality, which is not good for the engine and can only cause waste. If the cylinder is pulled, it will not only cause difficulties in cold starting, but also lack of power, and generally there will be abnormal noise. The cylinder of a two-stroke engine is relatively simple to disassemble, so it can be disassembled during maintenance.