While the stock cooling fan does great for a stock engine, once you bump in displacement, you need more air to flow to the head. Dump that heavy stock Zuma 125 fan for the DROWsports High Flow Vortex Fan! The DROWsports Zuma 125 High Flow Vortex Fan not only cools better by including more fan blades, but it's also lighter and will help free up some horsepower.