When building an engine, it's the little things that separate good engines and great ones. On initial start-up, getting a quick piston ring seal is critical—and having a clean, properly lubricated ...

Question 1: Does anyone know if the Gen 1 Duke 390 comes with undercut valve stems? Both the exhaust valves have a narrower ...

Engine building is technically a science, but the truth is that there is just as much art as there is science. Where most might think that the “art” part of engine building is in the design and ...