1.3M views · 742 reactions | “The way we interact with technology is going to be changed in ways we can’t even imagine.” --Heather Bellini of Goldman Sachs Research on the future of augmented and virtual reality. | Goldman Sachs | Facebook

Motorcycles evolved from racing bicycles, which is why early motorcycles were pedal-start. The rear wheel acts as a flywheel, driving the engine’s flywheels through the tensioned leather drive belt. I relieve cylinder pressure & compression by holding the intake valve open with my finger while I pedal the flywheels to speed. Once the engine is rolling over quickly enough, I let the intake valve seat itself, compression & combustion occur, & the 1910 @harleydavidson 500cc single fires to life. I