Hot Running Testing is the most important step to test the engine.To make sure the engine can work normally when you receive it . Generally speaking , we cost 1-2 hours on testing every engine . In this process, we check the assembly of the engine accessories and the clearance between the parts is appropriate, the engine is running evenly and so on . There is no doubt that we put a lot of effort in producing and selling engines . We have been committed to providing customers with better products and services .