What is the situation when the motorcycle is used for a while, the speed is getting slower and slower, and it can't run?

Motorcycles do have wear, domestic regulations that motorcycles can not exceed 13 years at most, normal is 10 years 100,000 kilometers, so many manufacturers, it is impossible to design a motorcycle can be ridden for a lifetime, the speed of the motorcycle is getting slower and slower, indicating that the car is having problems,



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