21:30 - Great job comparing the differences between the different engine configs & firing order. I haven't seen any other video on KZbin that bothers to line up different bikes to illustrate the differences. This is important since 2-cylinder engines have started to become extremely popular since 2000 and not many ppl know what the difference is and how to tell them apart. Before 2000, everybody was buying either 4-cylinder touring, street bikes or hardcore supersports. One thing you left out is... the **WEIGHT** and weight distribution. It is a **MAJOR** consideration, because many new touring riders don't understand its importance until they start adding a pillion and stuffing the panniers full of luggage... and then they realize they can't handle it.