How can I find out whether the motorcycle I bought in Sanya is national three or national four? Besides watching the EFI system.

Just look at the EFI system, you may not know whether it is Guosan or Guosi, because Guosan's car also has EFI, but Guosan's car in Sanya has no EFI, and it is all carburetor. Generally, there are identification stickers on the national four cars and the national three cars, indicating whether it is the national three or the national four emissions. In addition, you can also look at the production date. After July 2009 1, 2065438, it must be the fourth country. Before this, it may be the fourth country in the near future. Because it will be produced and put on the market in advance before the official implementation of the fourth national congress, it is also a way to look at the frame number and nameplate, but the accuracy is not very high. The best way is to look at the certificate. The third national automobile emission standard is GB14621-201,GB 14622-2007, and the fourth national automobile emission standard is GB14622-20/kloc-.