A motorcycle includes a main frame having left and right main frame members which each extend obliquely downwardly and rearwardly from a forward end to a rearward end. The forward end of the main frame includes a steering interface and the rearward end of the main frame includes a swingarm interface. An engine is attached to the main frame. A swingarm is attached to the swingarm interface and supports a rear wheel. A seat is attached to the main frame at an attachment location. The main frame, the swingarm, and the seat together at least partially define an open space of sufficient size to facilitate substantially complete access to the second cylinder head when the motorcycle is fully assembled.