Why does the engine shake at 2000 RPM but stops shaking after passing that point?

[Marian]

Resonance zone, which is a normal phenomenon. You can also inquire at a 4S shop. Below is an introduction about engines: 1. Introduction: An engine (Engine) is a machine that can convert other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. For example, internal combustion engines usually convert chemical energy into mechanical energy. Engines can be used as power generation devices or refer to the entire machine including the power device (e.g., gasoline engines, aircraft engines). The engine was first born in the UK, so the concept of the engine also originates from English, and its original meaning refers to that kind of "mechanical device that generates power." 2. Classification: External combustion engine: An external combustion engine refers to an engine where the fuel burns outside the engine; Internal combustion engine: The fuel burns inside it; Gas turbine: The working characteristic of this engine is that combustion produces high-pressure gas, and the high-pressure gas is used to push the blades of the gas turbine to rotate, thereby outputting power; Jet engine: Refers to an engine that directly generates reactive thrust by the high-speed airflow ejected from the nozzle.