Is it normal for 20 17 Weipai VV7 exhaust pipe to smoke seriously?

Not normal. Exhaust pipe smoke is generally divided into two situations:

1, blue smoke is generally caused by engine oil combustion. When the engine is working normally, the piston ring and cylinder wall, which have been in relative motion, gradually become thinner due to wear. There will be a certain gap between the two contact surfaces, and the mixed gas will run into the combustion chamber along this gap and burn at high temperature and high pressure, making the exhaust gas blue.

2. Black smoke is caused by poor fuel system and air intake system, resulting in improper proportioning and incomplete combustion. In this case, there will be a series of problems such as black smoke, knocking, insufficient power, unstable engine work, jitter and so on.