What engines do GASGAS use?

I'm curious to know, what engines power the motorcycles from the esteemed motorcycle manufacturer GASGAS? Are they utilizing cutting-edge, high-performance engines that offer exceptional torque and acceleration? Or are they employing more traditional engines that still provide a reliable and enjoyable riding experience? As a motorcycle enthusiast, I'm always interested in the technological advancements and engine specifications that set apart one motorcycle from another. So, what engines does GASGAS use, and how do they contribute to the overall performance and riding dynamics of their motorcycles?