Here are the solutions.

Why the engine needs protection?The role of the engine guard.

Let me introduce some small ways to maintain the engine at ordinary times. Do a good job of maintenance at ordinary times, so that problems are not prone to occur at critical moments.

Let me introduce some small ways to maintain the engine at ordinary times. Do a good job of maintenance at ordinary times, so that problems are not prone to occur at critical moments.

The bushing is a matching part used outside the mechanical parts to achieve the functions of sealing, wear protection, etc. It refers to the ring sleeve that functions as a gasket.

Before assembling, all parts, assemblies, lubricating oil circuit, tools, workbench, etc. should be thoroughly cleaned and dried with compressed air.