1, Remove the ground test of the exhaust pipe and air filter. 2, look at the spark plug before launch, there is a number of hearts. 3, the water tank is full of water. 4. Make all the oil used to refill the engine cleaner after adding new oil, without adding any additives. 5, four-stroke engine, it is best to open the cylinder head and see a tappet wear column. 6. Do two-stroke vehicles look around? Clean the exhaust valve. 7, listen to the sound, do not stand on the side, need a screwdriver to listen to the engine. 8, After the machine is warmed up for 10 minutes, take a look at the crankshaft, cylinder head, and exhaust temperature.
The best engine is on the used car. The best one can be tried and easy to judge. If there is no problem with a used car, it must come down and there will be no problem. Nothing is better than seeing a good car. Idle speed is steady. Smoke is a normal sound. Whether it is in the normal range, the engine speed can be increased, the temperature is normal, there is no leakage, and the road test speed is strong.
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