Hey guys, This is kind of a random question. I'm currently building a lightweight race car for a school project, and I need your input on the engine selection. I'm looking for a lightweight motorcycle/dirt bike engine to power the car. The maximum displacement is 600cc. What are some of the options out there? Preferably one with a nice and flat torque curve. The only one I kind of know is the Yamaha R6 and I've been looking at some of the KTM engines. Thanks in advance!