Note that several motocross (dirt) bikes do indeed have engines under 250cc, but we wanted to focus ... And while the relatively mini ZX-25R may not have the agility of a Ninja 650 or the oomph ...

But do you know how every major motorcycle oil brand stacks up? There are also options like the Lifan 250cc V-Twin engine, which is designed to fit mini chopper motorcycle builds. This unit is ...