Clean and inspect all parts, removing paint, rust, gunk, and grit. This is very important for internal components.

Reusing worn or damaged parts may result engine failure. Your local machine shop or engine builder can usually recondition worn parts rather than replace them.

Assemble the engine in a clean and dust free work area. Place oiled parts on a lint-free rag to avoid picking up debris from the work surface.

Use a tap to clean out threads before assembling parts.