2. There should be sufficient starting speed. High starting speed results in less gas leakage in the cylinder, shorter time for compressed air to transfer heat to the cylinder wall, less heat loss, and an increase in gas temperature and pressure at the end of compression. Generally, the required speed is above 100r/min.

3. The sealing of the cylinder should be good. This can further reduce the amount of gas leakage, ensuring that the gas has sufficient combustion temperature and pressure at the end of compression, and the compression pressure of the cylinder should not be lower than 80% of the standard value.

4. It is required that the clearance between the engine and the operating components be appropriate and well lubricated.

5. The battery should have sufficient starting capacitance and the technical condition of the starting circuit should be normal.

6. The starting oil quantity meets the regulations, the injection quality is good, and the injection advance angle must meet the requirements.